I find iTunes 12 to be one of the most confusing UIs Apple has ever shipped (it's up there with the Health app for iOS 8). I don't listen to all my music in iTunes, but I like to think that I'm not completely ignorant about the app either. I use it for iTunes Match, I am a regular iTunes Radio listener, and, of course, I have a huge library of apps in it. Lately, I've even been using it to listen to podcasts because I wanted to try iCloud sync.
I don't understand most of the changes that went into the iTunes 12 interface: from the lack of a sidebar to the new tabs for navigation and separation of media types and iTunes Store, I feel completely lost using the new iTunes.
Sidebar purists (such as myself) might be a little cheesed off by the starkness of the My Music view, but you can easily return to the sidebar by clicking the Playlists text button placed in the top middle of each media type view. This selection is sticky, so if you choose to view Playlists in Music, and then head over to view the Movies media type, you’ll return to Playlists once you select Music again. However, the iTunes Store view (available in all the media types, save for Tones and Internet Radio) trumps this stickiness. If you select iTunes Store while in Movies and then choose the Music media type, you’ll find yourself still in the iTunes Store — only switched to the Music section.
…I'm baffled by Apple's choices. This used to be simple: there was a sidebar with a Store button and you clicked the button and then you changed sections in the Store. Now, you have to account for “stickiness”.
I look at the screenshots of the new iTunes, I try to use the app, and I don't know what's going on. Maybe I'm the problem because I'm not “committed” to learning iTunes enough – but that's not supposed to happen with good interface design.