We always ride KRR at the very end of our Animal Kingdom day. Then we just hustle out to the car and go straight back to our hotel, or else we bring a COMPLETE change of clothes if we're heading somewhere else.
Apparently our children are trying to set some kind of World's Record, because we rode it 10 times in a row last January. Trust me, even with ponchos and feet up on the bars, riding it 10 times absolutely GUARANTEES that you'll be drenched. We use our T-shirts & ponchos for the ride, and then strip them off and change into a sweatshirt for the walk out of the park. Even in cooler January weather that keeps us warm enough to get to the car fairly comfortably.
Most of the fun of the ride, though, is seeing who is going to get drenched.