The brake before the corkscrew on Vortex is not a trim brake. It is a Mid Course Brake Run, which is very handy in keeping two trains from entering the same block and possibly colliding. The MCBR could make the train come to a complete stop, but it ususally only slows you down because KI is pretty good at dispatching trains. Not to mention, the MCBR on Vortex has always been there.
While not originally designed to be trims, the C block brakes on The Vortex have been used as such since the tracks first separated from their supports in the corkscrew in 1988. I'm also kind of surprised to hear your remarks on the dispatch intervals. Compared to the times we used to run, today's times stink. I know the stupid additions of the 2nd operator dispatch and the exit gate that needs to be locked after each train unload kills times, but it's still pretty bad aside from those things. Normal operation for Vortex was to not even use the ready brakes to hold trains. Using the safety brakes was at most a once or twice a day occurance and had to be because the darn things got stuck out there half the time and had to be pushed.
As far as The Beast, it's almost made me sick to my stomach watching how far this ride has fallen from greatness. I agree with the others who say it practically gets worse every year. The seat belts and waist bars dumbed the ride down enough. The speed at which it makes the loop today is an embarassment to its former self. Anyone saying the ride is as fast today as it was in years past never rode it in it's original 4 train/4 row per car configuration. Those trains were heavy, and they were fast. As in The Vortex C brakes, the brake shed on The Beast was never put there to trim speed. They were there to stop a train and start one aided by feed motors. This block division was necessary when running with 4 trains. Keep in mind, before the days of seat belts and waist bars, exit gates, entrance gates, 2 man dispatch, physically checking bars, etc., a 20-25 second load time was the norm. Today the ride is sad, it's almost depressing riding Beast anymore.