Mapping capslock to be esc is what made vim possible for me.

Just key 'j' followed by 'k'. I have this in my vimrc for quickly jumping out of insert mode: inoremap jk <ESC>

imap jk <Esc> In insert mode. First press j, in the same second press k.

The more common remap is probably capslock->ctrl, for both vim and emacs users, I but I definitely prefer capslock->escape. During normal operation, my left pinky rides the gap between a and escape(aka capslock). Pressing either requires the slightest of deflections to the left or right.

I keep escape as escape as well. Capslock is absolutely worthless to me.