I have a habit of typing 'jkjk...' in command mode when I'm thinking, and eventually I got sick of stretching my fingers to escape into command mode so I just used 'jk' as my escape sequence.
imap jk <Esc>
Of course now in non-vim editors I sometimes have to undo the occasional jk sequence... But my point is that the escape key can be whatever people want it to be.
some people discourage the use of the Esc key and prefer to use Ctrl-c instead. I'd recommend to disable it and force to use the Ctrl-c combo. I did it and completely forgot about the Esc key(actually I find it more comfortable)