Disney's Rider Swap option is available at select attractions in all 4 Disney Theme Parks at Walt Disney World Resort in Florida.
Rider Swap is when Guests take turns waiting with youngsters too small to ride a certain attraction, then "swap" with another adult Guest from their party to experience the ride without standing in line twice.
Ask a Cast Member at an attraction for additional information on Rider Swap.
I hope this helps! Let me know if you have any other questions!