In reply to nniff:
Yes, if you want to do lots of the rides, stay for the evenings. Last time I went, the queues for all the good rides were huge until about 5pm, then really thinned out. Either arrive later or, if you' re staying very local, take a long siesta back at the hotel.
And try to do what your kids want. If they want to wait for half an hour to talk to a teenager in a princess costume then let them.
Post edited at 14:16