I think it's way worse. The back button does something, but not what I want it to do. It seems to go back one song in the playlist, i.e. like the "<<" button. That's really annoying when you are trying to create a playlist while listening to songs in the playlist. You double-click on an album to see the individual songs, add one or two to the playlist and click on the back button of the mouse and... ahhh.... no... the music stops and switches to a different song. I only wanted to go back to the album view, like in a browser.
I'd really like to have an option to disable switching songs based on the back/forward buttons of the mouse.