One good way to get into action is to start with something small and simple. If you have an insurmountable task ahead of you, you start by chipping away it.
So I think it's somewhat dangerous to take time to clear the decks of every little thing. You deny yourself an easy kickstart.
The other tricky part is -- and this isn't a contradiction -- is there's a near infinite amount of not-really-important work to do. That might sound like you'd thus never run out of easy work, but you then hit a different problem -- all of the easy work you could do is slightly more pointless if you've done the things that actually really need to be done, and yet you still don't have the decks fully cleared.
I think it was Stephen Covey who said, "Your things-to-do list won't be clear when you die."
So that's two problems right there -- by clearing off the must-do easy work first, you run out of must-do easy work as a momentum kickstarter. But, you never run out of low-hanging work to do, so the decks rarely truly get cleared.
And a third problem -- it stops you from working on the big important things.
A better way? Jump into the big important things first.
Failing that as an option, start with something small/easy for 30-60 minutes, then jump on the big things.
Usually you don't want to spend 5-10 hours clearing off all the details. Every time I've had the bright idea to try it, it hasn't actually worked out all that well -- though if you've had a differing experience, please share it in the comments.