We have been to AK a number of times and I have a few more likes there than Wheelsie has.
I agree that the Tough to Be a Bug is a cute show. It can be scary for small kids, especially if they have seen the movie. When the villian bug (can't think of his name right now) appears in front of you about 6 feet tall, it is pretty scary. The Lion King show is really fabulous.
We also enjoyed Pocohontas and her Forest Friends - Pochontas is on stage and calls out real animals which walk across the stage from one place to another, sometimes across thin bridges of wood or branches. We also liked Flights of Wonder, where birds fly (sometimes across the audience) from one CM to another. My DD thought that was really funny since the birds fly very low and scare everyone. We also liked Tarzan Rocks (although most people either think it is great or awful). It's a stage show with very loud rock music, gymnasts, and performers on roller blades doing stunts on ramps.
The Safari is good, but kind of bumpy since your safari tram goes over rough roads. You can stay in the wheelchair for that. Dinosaur has a height requirement of 40 inches. You need to get out of the wheelchair for that. It's VERY bumpy and maybe scary for the littel ones since it is dark, fast and the dinosaurs all at once pop out in front of you.
There are a couple of walking trails that are wheelchair accessible (Papagani Forest Exploration and Maharajah Jungle Trek). If the day is hot, those are very hot and if they are busy, it's hard to see the animals from a wheelchair because people tend to congregate right along the fence or windows, blocking you view. The areas are really well themed though.
The last ride is the Kali River Rapids. There is a 38 inch height requirement. We've never been on it with my DD, but DH and I went on it in July to check it out. It wasn't as rough as we expected, but you will need ponchos to keep dry and your feet will get wet unless you can keep them on the foot bar. The regular baording area is a large moving wood deck. For people with disabilities, they tie a boat securely to a non moving part of the dock. You need to get out of the wheelchair for this ride and it would be somewhat difficult to board. The door is not very big and there are 3 small steps down to get into the boat.