The Smiler is a good ride.
However.
I've now ridden it on 3 trains, 4 trains and 5 train operation and have queued exactly the same amount each time I've ridden. And I can honestly say I prefer it on three trains because at least back then, they weren't flooding the ride with fastrack's and the queue moved consistently.
The park have in their hands a fantastic ride which is long, enjoyable, fun and full of variety. But I don't want to ride it anymore and it says a lot on how much they are overselling fastrack itself when there is a 15 minute fastrack queue for Oblivion and they have half the ride to themselves as it is, on a ride that is supposed to get 1800 people an hour. Either the park has given up trying to run their rides properly or the overselling of fastrack has become so severe that the highest throughput rides in the park can no longer handle the fastrack allocation.
So for now, I'll stick with Nemesis and Air, as far away from The Smiler as it is because those two don't feel the effects of a ride that is being flogged beyond its reach.