I have had some success at zone. I don't usually switch between 3-2 and 2-3 a lot, because unless you have a center with great BLK and a remarkably versatile SF, you need to recruit different players to run them both optimally. Also, so many teams are so perimeter oriented that 3-2 seems like a pretty good default most of the time.
The biggest advantage I see of zone is the ability to take a stud defender who isn't much on offense and an elite scorer who doesn't defend well and play them both, with the former's defensive strength balancing out the later's weakness.