My DD11 refuses to ride CS. She goes through the line with us, scoots through the coaster and waits at the exit. There is a yellow line she has to stay behind and she will usually go find a corner to wait in. We come back and all go through the exit together. She has been doing this for a couple years with no problems. She does not like ToT either but goes through the line and waits in the little hallway outside the elevator. The CM's are in and out of there and keep an eye on her while she waits. She likes watching the CM's act spooky and watching people come off the ride. I would not make her wait at all if it were not for her daredevil sister, who is 8. But I explained DL is for all of us and if you do not want to ride, you have to learn to wait at the exits for those that do! I think a 4 y/o would still warrant a ride swap but I bet it would only be for height requirement rides. I think someone will have to stay with them otherwise. Have fun!