You should! I've been an on/off Vim user for years, but only recently have finally decided to do all my editing in Vim and I can say that (after the typical initial re-learning curve) I'm more than happy.

This article in particular made me want to go back and try again, with a better Vim configuration file: http://nvie.com/posts/how-i-boosted-my-vim/

Now I've gotten so used to Vim, I keep closing tabs and chat windows when trying to delete a word I just typed (Ctrl+W on Vi). Awkward :)

EDIT: I linked the wrong article. Fixed now.

Also try FireFox with the Vimperator add-on.

Or Pentadactyl : http://dactyl.sourceforge.net/pentadactyl/ [+]

Don't use vi, use vim.