We've had varied experiences with the shuttles. If you're coming and going at non-peak times, they're great. But the 10 PM shuttles out of the park are CRAZY. Lord of the Flies crazy! Our best experience was with Doubletree (on City). It was free, and a really big bus. It was never full for us (during Spring Break), and the night-time driver said he makes continuous trips back and forth after fireworks every 10-15 minutes (even though the schedule is every 30). The worst experience was the Marriott Anaheim Suites (although we love that hotel). We had to purchase shuttle tickets and it shared the shuttle with another hotel. We had to wait an hour with cranky kids trying to get the 10 PM-11 PM shuttles. And people were totally rude and obnoxious. We were very close to getting a taxi. Our experience with Courtyard Marriott (which was a free shuttle) was just slightly better at that time of night. The second shuttle of the morning (most people don't get up in time for that first one) is always going to be crowded as well, but we've always gotten on fine.