Not only is there a queue for tickets but there is also a queue for ticket holders to enter for their allotted viewing time! We never realised this and turned up at 1.45pm for the 2.15pm show - there were probably 300+ people there already! We were very naughty and slotted in near the front of the queue - managed to get seats in the centre about 6 rows back - great view.
Watch yourself on screen when you get in - while the shows is waiting to start they have a camera which scans the crowd and gets people on film - we were on twice!
Enjoy, it really is spectacular.