I am a writer (or at least, I've written a couple of novels and a few hundred thousand spare words that are lying around waiting to be turned into novels, plus assorted other writing), and I have always written exclusively on a computer.
I should be clear that I'm not trying to compare myself with Stephenson or McCarthy; I'm fully in the amateur rank, but I would say that this is mostly a personal aesthetic thing. It's sort of related to the reverence people who hate "digital books" hold for paper copies; they'll give you loads of ultimately irrational excuses down to the smell of the paper as to why they prefer to read a "real book." I've been reading novels on a screen for years, and I've discovered that I quite like the ability to zoom in on small-font text or to hold thousands of books in the footprint of one on my desk (it's really a coffee table but shhh!).
Anyway, as for writing, it's like anything else on a computer. I don't think of it as "using a computer" - it's just a tool that lets me do what I want. Personally, I'd think that the ability to get a peek into how these guys organized their lives would be quite interesting (stumbling over their porn stashes, probably not so much, but undoubtedly revealing (hah!)). Think about all of the incidental stuff you could learn; art preferences (screensavers and so on), unfinished and aborted works, etc... I'd buy one from an author I liked, if I wasn't guaranteed to die poor by virtue of trying to be an artist myself. ;)