Sound doesn't bother him as much. If it gets super loud, it bothers him, but I've only ever seen him put his hands over his ears a few times. We're very fortunate because he doesn't have the issues with sound or traveling (although his first trip here was at 5 months, so he got used to traveling). His primary issues lie in verbal communication. He is verbal, but doesn't always understand and tends to not form sentences correctly (for instance, personal pronouns like "I" and "you" confused him). He also fixates on thing very easily. It's a bit like living with Sheldon from Big Bang Theory.
At the parks, he tends to fixate on a specific ride and won't settle until he's been on that ride. We started using the pass several years ago when we were in DL and he got fixated on Radiator Springs Racers, which was over a two hour wait all day. We finally got the pass (slightly different and called GAC back then) and had a much better trip. We have gotten the pass ever since.