I always wear Crocs at work, and they're hugely popular among nurses. Besides the comfort factor, it's nice to be able to easily wash bodily fluids off them :).

I also wear them day to day as long as it's cool enough to wear socks with them. I'ts nice to have something cheaper than Birks, and to not have to worry about getting the cork soaked in unexpected rain. But I don't really like the feel of them barefoot - and if it's hot and humid, the Croc material against moist skin gives me blisters.