You don't all have to wait in line. They'll give you a kid swap pass, and two of you can get in line, while the other stays with your 2yo. There isn't a lot for the little kids to do near the exit, but at least it's all indoors, in case it's hot or raining. Depending on how long the line is, you could take your 2 yo over to the food court or see the conservation movie or ride "Living with the Land." When the riders exit (it seems to me it was right next to the entrance?), you swap the toddler and use your pass to go back up through the fast pass entrance. Have fun!