Lukas Mathis argues that iTunes 11′s attempt to mask complexity with the new top bar that’s used to shift between media types results in even more complexity:
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.