We have Jump bikes in Sacramento, which are electric-assist bikeshare bikes. I think they're awesome and I use them all the time for errands. One time I rode my own bike from my house to the office, went upstairs to check my email, then came back down and grabbed a Jump bike to go to a dentist appointment 15 blocks away. There have been other times when my wife has dropped me off at work and I grabbed a Jump bike to ride home.
But 99% I ride my own human-powered bike.