vim is worth learning as it's on most systems and you'll probably need it in a pinch -- perhaps dozens of times, in some cases. Although nano seems to be on everything these days and it's much more approachable. But, I've learned to love the power of vi/vim, so I use that.

Somehow I've gone 30 years working without learning any emacs. Every time I try I get turned off by its philosophy pretty quickly. It's not for me, but maybe it's for you.