On our last trip, AK was not crowded at all and we went on PW 12 times in a roll! It is pretty jerky, so I agree with other posters who say it can hurt your neck, but it is fun.
We have a ride called Timerland Twister up here in MN (in the Mall of America) that is similar. It spins around while it goes down. The spins are much faster than PW and the drops are steaper, so I think PW is pretty mild in comparison.