For me personally it's the reverse. After 15 years of writing almost exclusively with vim (or vim-like) input scheme using anything else would really break my flow. Can you even do something like ct, (delete everything between current cursor and next comma, then start insert mode) in word? Even if you could, it would be some 5-key monstrosity which makes you move from home row.

Now granted, if you're just hammering out words without any editing this doesn't matter, but I think almost every piece of good writing has had 3+ revisions.

Of course this is a personal preference, but my friends who do a lot of writing (and never used vim at all) still seem to prefer a distraction-free editor with a lot less features and a much less noisy UI for the actual writing.