No one ever wanted to see my ds when we asked for the baby swap. Which was good, because he was 2 this summer, and if he got all the way through the line and found out he couldn't ride it, he would have had major tantrums.
BabySwap is very easy to use, though. When we used it this summer, it was just dh, me, and our two kids. We used BabySwap for my ds, which meant that dd got to ride those rides twice. Once with Mom and once with Dad. She really liked that! she got to do Splash Mountain twice in a row, while ds stuck with the other parent. He got to see how many times he could ride the Pooh ride while big sister rode Splash Mountain. It was very cool.
And utilize Fast Pass to the full extent. We would get one for Buzz, then, because the actual Fast Pass time wasn't very much later, it freed up our tickets for another FastPass. Plus, whenever we exited Buzz, we would get another FastPass. It worked out really well, without tying up our tickets for 2 hours.