[Revising when a chapter is done] keeps the love alive for me, and gives me the confidence that my book isn't a terrible piece of crap.

Yes. That's how I feel, too. I need that boost of being able to look back and say, "Hey, I know it can still be better, but for now that's pretty good." If I look back and all I see is a mess, I start to feel overwhelmed and discouraged, and the joy leaks out of the writing process for me.