Caps Lock being Esc is so convenient that I use Esc a lot more outside of Vim too. Stop the browser loading a page? a quick pinky tap on the caps lock. Take the focus out of a text field (so I can use my Vimium commands)? tap the caps lock. Decide not to save or open that file after all? caps lock's got your back.

The remapping was originally for Vim, but now at least a third of my Esc usage is outside of it.