I dunno of any other covid changes-
my express isn’t valid til after 4 (premier annual pass perk) and I haven’t used it on much since the reopen. For FJ 30mn is actually a perfect wait. I went when it said 15 and it was a walk on, which means the queue can’t be enjoyed since with covid procedures you can’t stand to the side to take it in; you have to keep moving but stay six feet back. I don’t know how much you know about FJ, but depending on how you count it there are seven areas. Personally I can spend several minutes in each area enjoying it without getting bored. Several of the rooms have people talking.
Regular differences as follows: If you are a huge MiB fan, express skips some posters and the coffee break room. Also skips the preshow and elevator ride but those aren’t being done right now. Huge Seuss fan? Do regular on the trolley to see a few neat things. Spiderman is two different queues. Mummy standby has some cool things.