None of the rides open early except for the ticketed Early Morning Magic event. The advantage a PPO gets you is that you are closer to the rides when they open, so you can walk up and get in line for the ride before the crowds arrive from the hub at rope drop (which happens around 8:50, give or take).
Same thing applies at Garden Grill. You can walk up and be first in line at Soarin, but they don't let you on until it is actually open.