I was only there once at a Saturday, but going in late it is important to know that pavillons close at 21:00. If you're in the waiting line at 20:00 for one, you won't enter the another one. Walk-ins finish at something like 20:30. There was also a massive amount of people exiting at about 21:00 (after the drone show) for the subway. They route people in a long snail to the station entrance, I forgot how long it exactly took, somewhere between 30mins and 1 hour.