We have used the UG exclusively in the past. We have found that even with the crowds in June its doable. The important thing is to have a basic plan of what you want to do when you get to each park and be flexible. That and using Fastpass, we have been able to do everything we want on each trip. Just remember it is VERY hot in June, so be prepared to take breaks, visit plenty of air conditioned attractions throughout the day and drink plenty of water. We live on the coast of Texas and are used to heat, but we still had problems the first time we went in June. We learned the hard way the importance of drinking plenty of water. Now we always have at least one of two bottles of water with us at all times.
