I'm very much in the yes we have free will camp. Judgment and decisionmaking happen. Descartes said "Cogito ergo sum" -- "I think, therefore I am" -- I've taken a similar approach to free will.
Besides, on the off chance we don't have free will and the universe is purely deterministic, you haven't lost anything. Why argue against free will? Making that argument only does something significant if we live in a universe with free will. If it's all deterministic, your judgments are already settled and automatic. You gain nothing in the no-free-will universe because you have no choice in that universe. Asserting your free will -- heck, just call it "will" -- this can only be helpful.
It's like Pascal's Wager without the opportunity cost. Declaring free will costs nothing. If you're right, it's useful to acknowledge and assert your will. If you're wrong, well, you were going to be wrong anyways, eh?
So, ok. Me on free will -- "Does it exist? Yes."
But I do muse over the mechanics of it. Clearly physics and causality reign in the universe; indeed, the universe seems to simply be physics and causality.
Thus, thinking "Humans defy physics in some magical way" would seem to be an enormous blunder. So, where would this free will come from?" We have it -- you can feel it, right? You're making decisions; you're choosing to accept or reject things. But how does it fit with physics?
I thought a lot about this, and eventually I recalled an argument I heard in passing some years before about how free will would be possible if the human brain was capable of generating true random numbers.
It seemed odd at the time, but I filed it away as something to think about later.
Somewhat recently, I pulled the argument back out and looked at it.
If the brain was complex enough to generate truly random connections, and additionally we had a deciding/control function, we would have (somewhat-bounded) free will.
The "somewhat-bounded" means your will would be limited to actions you knew were available. An isolated North Korean can not go on the internet, can not choose to go on the internet, and perhaps can not think of going onto the internet -- because they don't know the internet exists.
And likewise, you won't always think of all options. If you're mugged in an alleyway, your options are bounded to what comes to mind, options to accept or reject. Fight, run, survive, offer your valuables and beg for your life, yell for help -- any or none of these options might occur to you.
But, take martial arts classes and practice sparring, and time slows down, and you gain more options. Being more trained means more free will.
And even then, different options will occur to you. When you're trying to get out of the alleyway and one of a couple young toughs says menacingly to you, "How much money you got on you...?" -- you could make a joke, you could turn around and run back where you came, or you could launch into an attack.
But you have choice.
If the different options that occurred to you were at least semi-random, and you had a working executive function, then you've got free will. You can choose what to do, and novel choices are being presented to you.
And why couldn't the mind be able to generate truly new and random connections? It is an immensely complex thing, the brain. It seems very possible. As for the executive decisionmaking function? It's not always "on," but it's there. Cogito ergo sum, on that one.
If this conception is correct, or even correct-ish, it has something interesting to say that's informative on how to act --
Free will isn't unbounded, unlimited, and working all the time. If you are completely asleep in the middle of the night, you might not be able to wake up on command. Indeed, you might not have "command" at all in that moment. Likewise, if you're untrained in an emergency, you might get flustered and not have all your mental abilities available to you.
Instead, it implies that options come as a result of stimulus and randomity, and thus -- your free will comes from reacting to things as they occur, to novel connections and options. If you're at a point in your life where you feel trapped by external circumstances (this happens to all of us from time to time, no?) -- then you might be more-or-less stuck until stimulus or randomity gives you the option to break free.
But then -- break free! Use that executive function.
I don't think we have infinite, unbounded, unlimited choice. Indeed, most of the time we're not reflective, critical, or even remotely aware. But periodically we get real choices breaking through to us, and this is where will is exercised.
And like so many things, exercising of will gives greater access and ability to do so -- the more you exercise that command and executive ability, the more you improve at your ability to do so, the more you spot opportunities to do so, and the more able you are to re-shape your environment to give yourself even more will.
Perhaps it's as Sun Tzu said 2500 years ago in China -- "Opportunities multiply as they are seized." And will grows as it is exercised, on those key moments that choices break through to you.