Other benefits of Monaco, from Wikia measurements:
Users find content easier using fly-out menus - less people leaving after looking only at the main page.
More editors - people finding deep content are more likely to edit than just read.
From , on the usefulness of the Community widget:
"On Muppet Wiki in the last month, 1,404 anonymous readers logged in using the button in the Community box, 1,539 anon readers clicked the "more..." button to go to Recent changes, and 1,287 clicked on article links that they saw in the Latest Activity area. Those are readers who may not have been engaged with the site if they hadn't seen the activity going on in the Community box. On the other hand, logged-in contributors only clicked in the Community box 350 times. It's not designed for us; it's for the 91% of anons."