if you check out the hotels on site for their cost for that time period and see no discounts are available for that time period, the answer is yes then.
high season at any park suxs big time.
too many people....
also, check out the calendar hours for that week on the uo site.
if hours are extended, then that is an indicator of crowds.
i never go to orlando on easter break, christmas or thanksgiving times.
i sit back and read the trippies that talk about the crowds.
since i have no personal experience in the parks on the dates you want, that is why i suggest you find out the financial end of it. that should let you know of crowd levels.