Back in 1984 and 1985, Colossus did run one side forward and one side backward all year long. But at the time, they ran trains of four three-bench trains, and the ride was only about six or seven years old and not as rough. Also, running it backwards all year would take away one unique feature of Fright Fest.
The way it is now makes it sort of a training ground for newer riders for their first experience on a big wooden coaster.
My Honda will run ringz around your Saturn.