Good theme park but the queuing is too long unless...

Good theme park but the queuing is too long unless you're lucky enough to buy their ridiculously expensive premium passes. I wished the staff was trained to fill up the carriages rather than letting empty spaces to please a couple of people. We went on an inset day and still had to queue for 1.5h on the big rides. Of which, 2 of them were also shut for most of the day due to technical faults. It was a bit disappointing.