While it's not highly entertaining (they do have a huge interactive screen that many people participate in), Soarin is our favorite line to wait in. Between being inside, how you can lean against the walls (we even see a lot of kids sitting on the carpeted ground), and a very close bathroom to take turns if needed; we never mind the standby wait (bc we usually FP Test Track instead). If the adults have a couple of games on your phones, it'd be a line the kids could sorta relax a bit in and take a break from the heat (or cold) outside.