To be honest I didn't see any queue jumping and when it did happen the Staff noticed it and were stopping them getting on the rides and sending them back round to rejoin the queue.
Queue times weren't that bad but seeing as it was a 3 day holiday we wanted to make the most of it and get on as many rides as possible in the 14 hours. Biggest queue's I saw was around 2 hours for Tutuki Splash, 1:45 for Furius Baco, 1:30 Dragon Khan, 45 Hurakan Condor, 1:45 Shambhala, and that was Wednesday - Friday.