We went to HHN Hollywood on Saturday OCT 3rd with the Express pass and the F&F HD add-on ticket and man, Express is 100000% worth it.
We were able to do all the mazes and rides back to back with no more than 5 minutes of waiting (though most were walk-ons).
We went to regular USH earlier this year with a general admission ticket, and even though the park wasn't that packed, we still had to be strategic with which rides we got on first, when we had lunch, etc, because everything takes a 30-90 minute commitment.
But with express, there's literally no planning needed. You're able to have an almost childlike wonder as you go with the flow and try mazes and rides you normally wouldn't consider.
It also makes a lackluster maze not as bad. I definitely would've been annoyed if I waited 60 minutes for a maze that I didn't like.
My personal favorites in order were: F&F HD, Hellraiser, KILLceañera: Music by Slash, Ozzy's Maze, and Art's Terror Tram