I’m here today and have been here since Monday. I’ve done Early Park Admission every day.
Even though VelociCoaster is a headliner A LOT of people won’t do it due to fear. It’s awesome, but intense.
The majority of people still go to FJ and do wand spells during this time. A good number of people just get in line for Hagrid’s even though it won’t open until 9am.
This morning, for example, I basically walked onto VelociCoaster twice in 15 minutes. Whereas FJ posted a 35 minute wait by 8:30am.
This morning I decided to leave WWOHP about 15 minutes before offical park opening and head to Marvel Island. “Regular” guests were already coming in about 10 minutes before “offical” opening. Dr. Doom and Spider-Man were open. (This is dependent on if the rides are fully staffed and finished morning testing. You can’t plan on it though)
You are allowed to exit the park before offical opening if you wish to go queue for the other park.
They do not open the Hogwarts Express “early”. I jumped on yesterday right at 9am with no wait. The wait doesn’t really increase for the first hour.
I was in Diagon Alley by 9:15am and Grigotts was only about 15 minutes posted
Now…I need to add I am “true” rope dropper. I get on the first park bus and at the front of the pack. So, take that into account if your family can’t wake up that early.