Plug for Karabiner on OS X, which lets you use capslock as a control if you press it with another key, and escape if its released on its own. It has ruined me for other computers that don't have this set up. There's also a way to do it under Linux, but I can't remember what the package is that lets you do that.

I prefer remapping Caps Lock to Escape. Ctrl is already positioned pretty conveniently.

Yeah, I've seen that suggestion for many many years, but unlike evidently almost every other programmer in the known universe, I still use Caps Lock for its intended purpose (and yes, I know all of the ways I could avoid using it, but I still want to use it for that). I understand why people would like using Caps Lock for a CTRL key, as it reduces the stretch distance for many key combinations, but I don't find it enough of a problem to justify the change.

So, I basically don't mind CTRL right where it is. It doesn't bother me for the things I use it for.

For me, the two-handed combo of CTRL-[ is just a lot more work than the single-handed move of my ring finger to the ESC key. I don't have trouble getting my left hand back to the home row quickly after doing so either. Moving CTRL to Caps Lock would alleviate that some, perhaps, but I don't think it would be enough of an improvement to make me prefer CTRL-[ over Escape.