[technomancy]

Most Emacs lispers turn on Paredit after a little while. The major win there is never having invalid structure to your code, but there is the handy side-effect of never having to type a closing paren: http://www.emacswiki.org/emacs/PareditCheatsheet

Note the images in the article are done by static analysis of text files, which is very different from measuring what people actually type.