Yes - I recommend everyone learns how to use emacs (or rather, becomes familiar with it - there are so many add-on libraries and such that mastering it can take a while). I prefer to use vi, mostly because I am logged in via ssh, and depending on my client, I have to reset my keys (for meta, ^[letter], etc). Besides that - if you know how to use vi, you seem to automatically receive a badge of honor - "Ohh...HE uses Vi....wow...." - of course, the effect varies - most experienced sysadmins know that vi is both powerful and fairly easy to use, given time.