Over the last few weeks I've been using macvim and janus to write code. The more I learn about VIM, the more I love it.
It's not so much that VIM does things that I find particularly natural or “better”, but rather it's that it's extremely powerful for opening, managing, and editing files. Each little trick I get brings me more and more to the place where I can code as fast as I can think.
The Pragmatic Programmer(book affiliate link) tells us to know our text editors. The more I get to know about my text editor, the better off I am.