Aw c'mon OP! We already have our reservations for that week. Join us in the zoo! ;-)
In all seriousness, I do expect it to be very crowded. We have a stroller and will brave it with two little ones. But that will be like our 8th or 9th trip, so if we don't see and do everything, that'll be fine. We're bringing our travel trailer and staying in the campground, so if we have more downtime than usual, that'll be fine.