depends on what else i am doing that day. i used the single rider lines when i was doing the parks commando but when i started to slow down, i did the regular line if it wasn't too crowded. i think sometimes you miss some of the fun and interaction in the quicker single line. now don't get me wrong, on super hot days where i don't want to be bothered, i definitely use the single rider lines where there are some. i know that test track and expedition everest has one. someone else posted a few days ago that rock and roller coaster has one as well now. not sure if there are others but i am sure that someone else here will help you out.