I'm kind of neutral to the idea. 2000lb cars wiz by me at 30+ mph all the time. It is part of sharing the public roads. It would be nice if everyone road a bike, but that's not going to happen any time soon. Car drivers are generally more predictable than the runners and strollers who share the bike lane with me.

Edited to add: Someone else's post reminded of one other point. Cars wiz past me at 30+ mph in the bike lane as well. Actually, sometimes a bike lane encourages them to wiz past at speed when no bike lane will encourage some caution.