Crew makes a difference too. I've been on Nitro where they can get a train loaded and out in under a minute and later that day when they change the crew it could be longer. Also, there could be different circumstances per train. On Apocalypse (it was Terminator back then) when the ride ops were having a contest to see who could push down the lap bars the fastest (becoming more and common and rides which I like. Adds excitement lol) and one kept popping up so they had to lift all them and put them all back down again. That happens on inverts a lot too. Like if a it goes down a notch too far and is uncomfortable they have to raise all bars on some, but just the car on others...
Also, when there's a single rider line it makes people like me ecstatic. When you spend two full days at Cedar Point waiting on every line alone and watching EVERY SINGLE MF train with a half dozen sporadic empty seats, the single rider line halfway through Maverick is the best part of your visit. Actually, once when I was on Maverick there was no guy there so I nonchalantly line jumped that whole staircase area