I don't tend to use Caps Lock at all - I know a lot of people remap it to be escape, just like OuterVale has mentioned, but for me it's just a key that I never use. Then again I no longer use home, end, page up and page down keys either - I switched to a split keyboard that doesn't have them as separate keys and you need to press a Fn key with another key to get them and as I live in the terminal for all my real work I just switched to using the CTRL key combinations instead.