I think the only way they meet the dispatch times is to have mandatory loockers, like X2. Just look how long it takes to load full throttle, due to people stepping over to put stuff in the bins.
With that said, I really am not a big fan of the mandatory loocker thing, but it makes sense for some rides I guess. But I always felt that if you only had the refillable drink bottle, they should accommodate that. Superman Ultimate Flight does that at SFDK. It just burns me to have to pay a dollar (I know....wah wah) just to stash the bottle.