One of the main problems introduced in iTunes 11 is the new bar atop the iTunes window. This tiny thing combines a vast number of features that were previously served by many different UI elements in iTunes. Sure, the bar seems simple and friendly. How much damage could this tiny thing possibly do? Well, you can’t cram so much stuff into such a small UI element without causing problems.
I gave the new toolbar a shot, but this article convinced me to bring back the sidebar. Everything requires less clicks this way.