User blog comment:BertH/Layout and navigation updates coming October 3/@comment-168424-20120920000145/@comment-3508190-20120920044901

Tastes differ of course, but I do think the fact that the expanded menu is more prominent is beneficial. You can spot it right away and it's given more weight. I'm not at all surprised to hear that Wikia's research shows that it's used more often too.

That and the fact that you can put a lot more links on it since there's one more level of depth.

With a user script like my Wikimarks you can customize the "On the Wiki" menu too btw.