Almost everyone is this thread is NOT riding because of the probability of getting wet. Even with a poncho you get wet. I don't know anybody that enjoys walking around in 40-65 degree weather with soggy shoes.
IT'S TIME TO ENCLOSE THE RAFTS IN WINTER!!
Even if the enclosure was only 1/2 way up, they could keep almost all of the water out and the ridership would go up. Besides, Disney is already paying for the electricity to run the attraction... I don't know why they don't make it more attractive to the guests by trying to keep them dry in the wintertime.