I gotta be honest with you, I went last year during Easter week and plan to go again this year. Although I was only with one other person, the longest we waited for a ride was 30 minutes, and I had 3 days, and the 3rd felt to be too much. Easter Sunday was particularly slow, as I had predicted it might be. I plan on going and not buying express unless I get there and it's too crowded, but we rode all the rides, some multiple times, and the third day was just a bonus.
I think you should be fine, but with such a large party it's a tough call.
I think you should be fine, but with such a large party it's a tough call.