Expedition Everest has a single rider line that is always so short and I'm pretty sure you can stand off to the side and see the whole line up until he boards. This line is to the far right of the entrance. Can't wait with him but usually there's about 5-10 people in line so I'd imagine he'd be okay for a few if he can see you and you can see him. Test track also has a single rider line which moved quickly, although indoors. Your best bet is definitely going to be EE, maybe let him ride a few times in a row if the other fun rides won't let you wait with him.