Went yesterday, arrived at about noon
(was shooting for opening, but my phone alarm hates me

)
We did both parks, the Studios first.
HRRR was about a 10 minute wait.
Mummy was 5. What I found interesting was they appeared to lead us through an extended queue area (maybe for express passes??) before we made it to the ''normal'' queue section
After Mummy, we hit MIB. The sign said 15 minute wait, I seriously think we waited 3 minutes to get into the auditorium, and walked on the ride right after.
Simpsons wait time posted was accurate, about 10 minutes.
We then went for a second trip on Mummy and utilized the single rider line. (wait time was still posted at 5, but we were right behind a large group of people..overheard them tell the TM they needed 9 seats on the ride, and I could see the wheels turning in his head as to how to get them all on the same car while still being able to fill the waiting car)
Second ride on HRRR was posted at 5, was closer to 10.
Over at Islands, Hulk was posted a 5 minute wait, and was a walk-on for all but the front row. And even that row had maybe 7 people ahead of us.
Spidey was posted at 15 minutes. We walked clear through and didn't stop walking until we were handed out 3dglasses
FJ was maybe a 10 minute wait (wait time listed was 15).
I've found that Thursdays really are the best day to go to the parks, and the weather was awesome too. We were there for 11 hours (between both parks, TNA Impact, and Citywalk after Impact) and I still feel I could have stayed even longer (especially not that I'm looking back at this and realizing we only did 3 rides at IOA?!)