We did the Hollywood and Vine Fantasmic package last year and I have to say this was the one issue of our whole trip that annoyed me
After dinner we walked over to the show and found a great seat in the reserved section. Even though we knew we had reserved seats we got there early enough to allow time before the show. About 5 mins. before the show started and 5 mins after it started people were coming into the theater and the CM's were making all those in the reserved section squeeze together to fit them in. It kind of annoyed me because we paid for the Fantasmic package and allowed ourselves the extra time, yet spent the entire show crammed into our seats - in fact, my5 yo DD was so squished

she ended up sitting on my lap, which wasn't very comfortable for either of us.
Sorry to vent

but it was the only part of our trip that was less than magical!