Hey,
Everyone here has pretty much given great advice on the subject at hand, um, feet. Me personally, I just got a front brake put on one of my fixies after a year and some months riding without one. To me it's just an emergency brake but I've completely changed my style of riding when I did not have one. It's all about timing...... When to slow down, speed up, should I let this car pass me or swerve around it, etc.
It takes awhile and I think it makes your riding style interesting, fun, challenging, scary, all at the same time. Do any of you other riders feel the same way?