Having ctrl-[ in your muscle memory has the advantage that it also works in other readline programs that have a vi like interfacee, e.g. bash, zsh and many db consoles.
I recommend mapping jk to esc in insert mode (instead of jj), so you remain on the same line if you accidentally use it in normal mode.
Re:How Did Vim Become So Popular?
by contravariant on Wednesday July 01, 2020 @07:10AM
(#23700169)
Note, don't do this if you're Dutch, words with 'jk', or rather 'ijk' in them are annoyingly common.
I switched back to vim+tmux (nvim) a few weeks ago from a number of years using vs-code with the vim keybindings.
I'm still trying to configure my plugins so that I don't feel like I'm repeating myself too often.