Did someone call?
For all chicken exits you can wait until the very last minute and then, when the CM asks you Combien? or How many? just say that you don't want to ride and then you can exit.......
TOT and Star Tours: the CM will take you through a separate door to the corridor where riders come out;
Crush and RnR Coaster: there is a door next to the loading area which takes you backstage behind the ride and takes you to where riders disembark.
SM and Indiana Jones: there are stairs back up out of the loading area, opposite where you come down.
BTM - this is the only one where you have to actually climb through the ride, but don't worry, you have plenty of time.
It is defintiely worth queueing, just to see the theming around each ride.