Well, one thing I've found out for sure. You know all the advice that you have to just get the first draft out, don't stop to edit, etc.? I've always been an edit-as-you-go person. So in this NaNo draft, I'm going along, come to a spot where I realize I want something in a previous chapter that isn't there. Like a zooming first drafter, I stick in a note and kept going - for a while. And I kept going slower and slower because the need to add that something and straighten out what came before and after so it fit smoothly bothered me more and more. In the end it was go back and fix or fuss and fume over it so much nothing else would get done.
Some part of me always believed I'd be better off doing the draft straight through thing. Now I know it's never going to happen. For me The Other Way isn't a choice but a compulsion.