"One reason I like writing by hand is it slows me down a little, but it also forces me to keep going: I'm never going to spend half a day noodling with a sentence to try and get it just right, if I'm using a pen. I'll do all that when I start typing.
(The main reason I like doing first drafts on paper though is it's somehow fooling myself into thinking it's not real, and I don't mean it, until it starts getting typed. On the other hand, all screenplays happen directly on the screen, and I'd feel almost silly trying to handwrite them first. It's why I'll use Final Draft -- I like to be able to get screenplay dialogue down without thinking or pausing, and then fix it later.)"
More how we work.