This makes sense. As a user who expects to have control over the interface of my primary mail client, my first impulse was to hide the Buzz menu by dragging it

This makes sense. As a user who expects to have control over the interface of my primary mail client, my first impulse was to hide the Buzz menu by dragging it into the "more" dropdown. But I don't think a lot of users expect to have control over websites they use -- Facebook changes its interface every other month. Most users probably just ignore most of the page and focus on the two or three features they actually use.