With as much time as I spend on remote systems for my entire career, Vim was a natural choice. At first, I used it simply due to this fact, but over time I learned more and more about Vim's capabilities, and I still use it regularly.

I've found MacVim to be a mixed blessing over the years; I appreciate the combination of fully featured Vim combined with the native Mac editor interface, but I honestly prefer to be in the terminal as much as possible.