Hahaha, no kiddin'. Then of course you've also got certain parts you can't wait to write, but you never really feel like writing the more boring stuff that should come first. Or at least, that's how it is for me.
I've devised a solution to this problem: Make EVERY. GOD. DAMN. PART. AWESOME.
Admittedly, this is easier said than done, but there's a general principle to it. I mean, the exposition is boring, so cut it out and begin in media res. Et cetera.
I also try to apply this to characters as well...if a character is not suitably developed, interesting, and awesome enough, they simply get cut from the cast or reworked until they do. I think that's a serious problem in some works, a certain character or core group of characters get all the glory/coolness/power and the rest are boring, but necessary supporting cast. Hence, why you get mary-sues.
That's why instead of having one all-powerful author insert mary-sue, I prefer to have about ten mary-sues all trying to one-up each other.