I agree with Snow White completely. We were there the same weekend and the band kids were HORRIBLE! The mess before you even get in the park was really bad and it took us about 45 minutes to get into the park. Also, the express lines were horrible and even the kids that didn't have express were using the line anyway and none of the attendants were checking for express passes or hotel keys.
Also, that is the week of our spring vacation and almost all of N.H. Mass., and Maine (probably VT. too but I'm not sure). If you can go in the middle of the week, that would work better. That being said, we love Universal and would go again during this time frame, maybe just plan better and not be at the parks right at opening. We will be there next month for Vetran's day, have been during that time before and it hasn't been busy, but it certainly could be. In case that happens, we just hit our favorites and have lots of pool time at the HRH. Enjoy!!!