Hi.
As part of work for https://bugzilla.wikimedia.org/show_bug.cgi?id=40346 ("Convert some MediaWiki user preferences into JavaScript gadgets (tracking)"), I did a quick evaluation of current core user preferences: https://www.mediawiki.org/wiki/Requests_for_comment/Core_user_preferences.
It seems like Special:Preferences could really use some love, if anyone has an interest in this area.
MZMcBride