[stinkytaco]

Piles and piles of automatic formatting, for one. Working with tables in org-mode is really nice. That an emacs lisp means you can customize various parts to your liking. I used to have a snippet that would assign ids to elements automatically. I can also customize export, etc.

And, of course, like someone mentioned, being able to interact with your document almost like it's a proper data set that you can manipulate programatically.