According to the search FAQ, to search for a user one uses the search parameters "user:<user>". However, searching for myself actually yields a search result that appears to match all posts matching "user". Am I indeed not worthy of "Super Ninja" status, or is this a bug? :)
EDIT: Now that this is answered, the question has morphed into a feature request.
EDIT2: I should have tried to use the "Users" tab, rather than just the search bar.