I'll do my favorite per-coaster-
Adventure Express- The helix down into the 3rd tunnel
Backlot- The s-curves after the helix
Banshee- 0g roll and that long drop into the batwing
Bat- the fan curve over the station
Beast- The helix and the series of drops between the 2nd tunnel and the 2nd lift
Diamondback- The hammerhead, especially on the right side of the train on the outer rows
Flight of Fear- the launch and the build up to the corkscrew at the end
Invertigo- the fact it can pull enough G's to make me grey out and nearly black out every ride
Mystic Timbers- the 2nd big drop into the valley, it's still flying and it's a good sustained ejector air moment
Orion- the 2nd and 3rd hills with the lateral airtime while also losing sight of the horizon for a bit of disorientation due to the combination of the upward angle and the overbanked elements
Racer- the bunny hill between where it splits and the turn around, they always have insane air at that part
Defunct rides-
Vortex- the first drop in the back of the train
SOB- the first drop and loop
Firehawk- the overbank hill
King Cobra- either the loop or the trick track