Oddly, I haven't customized mine heavily. I'd assert that there really isn't a single "crowd" that are computer users. All the more true for stuff as customizable as emacs.

Even more amusing, I'm fairly certain I had more customization in vim before I decided I wanted to learn lisp. What ultimately killed my customization in all things, was I felt like I was customizing on top of a very shaky foundation. Emacs/vim are stable enough, of course. But building/packaging software is basically a giant playground.