It should be pretty easy to grab an aisle, even if you have to sit back a little ways. Try to be early in the line.
We also had great success planning to be at the first show of the day, and yes, we did return for another showing later in the week.
We also "sufferred" from the merch. cart just outside. Good stuff, though.
Our just turning two year old loved this show so much.
I videotaped the entire show and put much of it into our trip video. Now 2 1/2 years old, he asks to watch the video every day and especially the Bear part. He actually walks around saying "Disney, Bear, Tutter, Ojo, Pippop-Go Disney". He doesn't yet understand that we ARE going back in July, but I know we will be at that show a couple of times that week.
Enjoy!