Hello Jennifer and thanks for bringing this great question to the Disney Parks Moms Panel!
Disney's Rider Switch Service can certainly come in handy when little ones are not up for some of the big attractions. Simply go to the entrance of the attraction for which you would like to switch and the Cast Member there will help you. The best thing about Rider Switch is the parent and child that are not riding can go and have a snack or enjoy a show until they are rejoined by the other parent and the "switch" takes place. Currently the Rider Switch Service is available at the following attractions:
Magic Kingdom Park Big Thunder Mountain Railroad
Splash Mountain
The Barnstormer
Space Mountain
Stitch’s Great Escape
Tomorrowland Indy Speedway
Epcot Mission: SPACE
Soarin'
Test Track
Disney’s Hollywood Studios Rock ’n’ Roller Coaster Starring Aerosmith
Star Tours® - The Adventures Continue
Twilight Zone Tower of Terror
Disney’s Animal Kingdom Park DINOSAUR
Expedition Everest - Legend of the Forbidden Mountain®
Kali River Rapids
Primeval Whirl
If you have more questions or need clarification, come on back to the Disney Parks Moms Panel- we love to help!
See ya real soon,
Anne