I am afraid of everything involved with that bridge crossing (heights, bridges, water, crocodiles), but did the Wild Africa Trek and would do it again. You are harnessed in and the guides are very safety-conscious. They take your picture in the middle of the bridge crossing and again toward the end. My first picture is pathetic; I was frightened and put a big, fake smile on my face. The picture at the end of the bridge was much better because I had conquered my fear and made it! There was more than one person on the bridge at a time, but we were spaced so one person wasn't right next to another. I don't recall the bridge swaying, but it did move. As I was crossing the bridge, I just had to keep telling myself that despite my fears that if it wasn't safe Disney wouldn't be doing this. I still can't help but smile when I see that second picture when I was standing on the bridge with the crocodiles beneath me. I know this doesn't sound like a big deal to someone who doesn't have the same fears, but it was for me!
Since by the time you get there you've already been harnessed to view the hippos, knowing she'd be harnessed made her feel safe. It was wonderful for her to feel more adventurous in a non threatening way. Since it takes a bit, and everyone else was in between us; I was anxious to find her feeling akward having waited that long on the other side without us. She didn't even notice when I walked up. 
She was having too much fun talking to one of the guides and an older teenage girl. Besides all 3 of us absolutely loving the tour in general, it was worth every penny simply seeing her come out of her shell, experience some independence, and feel proud of herself. 
