I think every author, although they might love the whole process of writing (or hate the whole stupid business and the book they're writing which sucks and will destory their career, depending on which day you ask) probably has a favorite part. I know just from talking with the playfriends that each of us either enjoys, or performs best at certain stages that are all different.
I, no doubt, am a 'partial' girl. Three chapters and a synopsis are no sweat. Once I come up with a story idea and flesh it out a little in my mind, I can write a 5-7 page character based synopsis without much effort. Don't throw things. I know it's not normal. The pansters don't understand it and the plotters envy it. Its just something I don't have to try too hard at. The same with the first three chapters of a book. Usually, as a story formulates in my mind, the opening scenes sorta play out in my head. I know exactly where to start, how to introduce my characters and all their quirks and motivations... I can't wait to start a new story. I could write partials all day as long as I have enough new ideas to back them up. You have no idea how many files on my hard drive I have for books with only two or three chapters.
For me, starting is easy. It's that damn middle that messes me up. I'm great at the cute-meet and setting up everyone for a wild ride. But when the drama starts to play out... I lose interest. It gets too hard. I'd rather start another new story, which of course is more interesting and shiny. And if I force myself to slog through, its painful, but I usually pick up speed and start barrelling toward the end. The only thing that stops me then is that darn tricky emotional realization scene. Sometimes I just skip them entirely and go back and write them later. Nothing slows me down like alpha male emotional angst.
What's your favorite part of writing? The plotting? The revising? The joy of a new story or the glory of finishing one? If you don't write, do you have a favorite hobby that you enjoy parts of more than others? Planting the flowers, but not pulling the weeds?