Yeah, I know one of these people too. I know one for Emacs, Eclipse, Excel and of course SublimeText.
Honestly, I don't see why some folks obsess over text editors/IDEs. Familiarity and mastery matter way more than features. Sure, a truly barebone editor like Notepad.exe or nano might be insufficient, but any editor with a decently-sized following has enough features to make its users comparably productive - as long as you learn how to use them (This is almost a self-fulfilling claim: if an editor has a sizable following, that means it got something right for its users).
I mean, how else do we explain that Rob Pike uses Acme, Joshua Bloch uses Emacs to write Java, and Paul Graham uses vi to write code and prose?