It's been a year since I deleted all my photos, removed all friends, changed my name and iirc swapped in a throw-away email address on fb. Haven't missed it a bit. Was doing some fb integration for work and logged-in to test out a few things. Seeing the timeline layout for the first time made me miss facebook even less.
I didn't. I created account for some integration in work started getting tons of invites. Eventually stopped using it nearly years ago. Not missing it at all!
I quit a couple months ago, couldn't be happier. Facebook seriously depressed me, I'm glad to be rid of it.
i haven't gone back, it's been probably at least half a year, and there is no urge to return. twitter is nearly impossible for me to leave though.