I'm another jk devotee, I use caps lock a lot more. I don't get the complaint about using other servers. Either you control them in which case :tabnew ~/.vimrc and adding imap jk <Esc> takes a few seconds, or you don't control them and so you just run the map command locally for your current file. My vimrc is around 200 lines but the jk bind is the only thing I must have these days. Enough forced Eclipse has beat it out of me, but I once had the habit of typing jk outside vim while thinking.
