As a non-lisper, it always kind of amused me that vi had brace-detection in the % command. I mean, what self-respecting C coder doesn't know where the other bracket is.. oh wait. ok. That's useful for me.

Then you wind up in emacs, editing a .emacsrc file, marvelling at the .. depth of germanic (((( ... things) which need to be said)) by this person) nesting.. wondering what you do...