Ubuntu is experimenting with a new UI replacement for the menu bar. I’m seriously sleep-deprived, so I might have missed this, but there’s one big advantage in well-designed menus: they’re discoverable. Best as I can tell, if you don’t know about a particular function in complex software (and let’s face it, almost all Linux software is complex), you’re never going to find it. But with menus, you can also go searching for commands you’ve never tried before.