I typed solely in QWERTY during the holidays. I was surprised to find today that I didn't lose much. My Colemak typing speed is still about 50 wpm. Though my accuracy suffered a little (97%, down from 98%).
VIM is currently my biggest conflict with Colemak. There is a VIM remapping for Colemak, but it's too complicated for me. I don't understand all of what's going on. I do believe some features are missing, such as folding. I saw folding in the comments and tried uncommenting it, but couldn't get it to work. And there's the problem. It's easy enough to learn some new VIM feature by looking it up on the web, but it's too complicated for me to then figure out what the remapping in Colemak is.
I discovered the Solarized theme recently and want to use it. Of course, there is a nice theme file to use Solarized with VIM.
It seems for now that I'll just continue to learn Colemak, VIM, and Solarized separately until I understand enough to get everything I want together.