We just got back from Universal. Yes, USF was the one with early admission, and the only things open were Despicable Me and Diagon Alley.
I was disappointed with the up-time of Hagrids. Our first day at the park was a half day, and we didn’t ride Hagrids because we planned on rope dropping it the next day. We lined up at about 7:35am on our second day and there was only one other group there. They announced that Hagrid would have an extended delay that morning. When the park open they walked us back through Seussland, and parked us behind the talking fountain near the entrance to Hogsmead. At about 11am they took pity on us and gave us Express passes that were good for the Hagrid ride. Sadly, the ride didn’t open at all that day. The next day was a half day for us, and we did the early admission at USF, and we kept checking the app to see if Hagrids would open. We gave up hope around 11 am, and then miraculously it opened! We were super happy to get to ride it…once with the express pass and once in the standby line. Moral of the story…if it’s open and you are there, ride it!! You never know if it will close and stay closed until after your trip.