I've been using emacs since 1993 (with a long gap between 94 and 99 where I barely used computers at all). I like to say that it was the only thing that remotely made any sense on the X-windows machines I had access to. I like to say I learned it then, and I haven't had to learn anything new since.

I tend to declare emacs config bankruptcy every few years, so I work fairly close to uncustomised emacs.