At least as far as the demo goes, you are absolutely correct.
It's funny, NCAA 11 had zero zone defense effectiveness, against a user or CPU it was basically giving up a first down 90 percent of the time.
Zone D was a big "feature" touted for NCAA 12 and I felt it delivered, that game, out of the box and pre-patch, had some pretty stellar zone D, cover 3 in the 3-3-5 sets was unreal. I feel like a lot of "Joe Casual" gamers didn't like throwing 5 picks a game and refused to adjust, instead opting to complain to EA non-stop, and it seems like it has taken a step back since 12. Still better than 11 though. I run a lot of zone, love it because I play as the SS and it is just more exciting for me than coming out in Cover 2 man every play. Hopefully zone and man are more balanced this year.
I feel man, in the demo, is as good as it has been for a long time.