I don't do dialog. I learned to write on E1 and E2, and later writing lots and lots of philosophy papers. I write in a very philosophical (read: pretentious/dispassionate) tone by default. I've also written thousands of posts on various web forums and newsgroups, which are also dialog-free.
I wrote (started) some Really Lame Stories when I was young (8-12yrs), but have done very little dialog since. Even when I wrote papers for English class (two fictional stories in all, I believe), I kept dialog down to a couple lines. I have no need for characters to talk. I always focus on describing or explaining things--not because I'm good at it, but because I prefer it to dialog. Dialog always sounds silly. I don't drive the conversation in real life; I let other people say stuff and I'll answers their questions. Sure, I'll synthesise stuff, but delivery is usually in the form of a short quip no one will get. How can I write a dialog if I can only manage the response-half in real life?
I may end up writing a rather unusual novella next month. Maybe I could make all the characters mute. Maybe I could have just one character so he doesn't have anyone to talk to in the first place.