I was wondering this.
I was at the park the day of the taping (they did't shoot til about midnight) but it took up a lot of space.
Getting to the Mummy in particular was a bit of a tax because of the course being out and the wait was minimal all day... I think people couldn't be bothered to tackle the diversion.
They were also filming the families of the contestants in the parks - I was boarding the hogwarts express as they were filming a family do the same and we were sat on the train a LONG time while they got the shoot right so I would imagine we will see quite a bit of Universal Orlando in the finished episode.