It used to be that staying in the club level was the only avenue to the "Sunrise Safari" behind the scenes tour with extended Safari ride at the Animal Kingdom Park. That was the prime reason that we stayed in a Club Villa.
They have temporarily (maybe permanently) opened the Safari to all guests at AKL.
If they change it back, however, that would be a prime motivator for trying to reserve a Club Villa as that tour is really nice, and not ridiculously expensive, considering that you get a fantastic breakfast as well.