As a vim, linux, shell guy, I still love my mapping of Caps Lock pressed to CTRL und Caps Lock released to ESC.
Being able to reach CTRL and ESC with the little finger while keeping your hands on the home row keys is great.
Caps Lock <—> Esc should honestly be standardized on keyboards. Esc is used pretty often in my experience while Caps Lock, being modal, only gets the occasional press even when used.
This is trivial to map on QMK/ZMK mechanical keyboards too, using mod-tap: https://docs.qmk.fm/mod_tap