Same for Esc to leave it, C-[ works much better.
Also pretty popular to remap capslock to esc, I tried it but never got used to it.
I can't remember where this used to hit me. Perhaps some abbreviation with u ?? I notice I've commented off "uu" but still have "jj".
I still go up and slam the ESC key after 20 years of vimming. How do i get into the habit of C-[ ?