I see 1 (other than mine) every morning. It's a woman who has the opposite commute as me and I pass her every AM. There is also another parked in front of the library several times a week. I usually see a few others here and there.
It was kind of funny last week, I was driving down the highway and saw another Prius, she got behind me and followed me, then another Prius came up, so there were 3 Gen II Prii in a row. It was pretty cool.