I live in Southern California. If there's no curb, there's probably no stoplight either. It also doesn't rain here, so our roads don't have enough crown to offer up a foot preference.

I've also watched people get on their bikes-- with few exceptions, the leg they swing over is the "not unclip" foot. I get on my bikes from the right, so my left leg (the one I don't unclip) goes over the top tube. I've tried getting on the other way. Hips don't work right.