Earlier quoted context omitted.
Vim users do indeed. I still get a bit of ESC pinky, but not nearly as bad as the default layout would cause.
Wouldn't you hit ESC with your ring finger or middle finger instead? (When I used vim, I preferred Ctrl-C so I would not have to move my fingers so far.)
Side note - I've noticed a big improvement in general hand pain since I got into climbing regularly, and specifically starting working with a hand exerciser.