I spent the last week in the Tampa Bay area of Florida on vacation. Tampa is quite the opposite of Seattle, the last major city I visited. I literally saw no bike commuters like I saw in Seattle and Bainbridge Island, where the ferries dropped cyclists off to pick up their bikes at a bike lock-up for a commute home, or anything like that.
The only bike commuters I saw in Tampa were obviously folks who couldn't afford a car, and the bikes they rode were generally dirt bikes of some kind - the kind we'd probably have called "BMX bikes" back when that craze was flying around. I even saw some of the old banana-seaters. And the entire concept of working with traffic was lost - most of them were glorified pedestrians. I never saw anyone on the street unless they were crossing it - and then they were usually jaywalking.
It was a bit depressing, obviously. As far as cities like Seattle (and hell, even Columbus) have come, there is much further to go in cities like Tampa.
A bright spot was Clearwater, where my family and I spent three days. Clearwater was a car haven, but it also had bike taxis, cyclists commuting out to the beach from Tampa (though on the sidewalk, which actually looked a bit like a multi-use path, and I'm not sure what the status of that path was, but I'm going to call it a sidewalk), and a few people cycling around just for fun.
And though we weren't there during a particularly busy time, there were also bike taxis in Ybor City, a part of Tampa Bay with a lot of Latino history and lots to see. We saw the taxis locked up in a parking garage, obviously waiting to look for business during cooler hours of the day.
I think the heat down there probably discourages a lot of folks. It was Africa-hot down there. But at the same time, I think that many folks would feel better IF they biked more often - I find that my tolerance for weather has increased since I started biking for transportation, and though Tampa would have been an extreme example of this, it still might help.