I usually stop at lights almost all the time because I'm usually riding somewhere in heavy traffic and there's no way to try to run a light without being killed. I also respect the stop sign but only slow to a crawl and if I have to, trackstand a little before it's my turn.

Having had my third accident in six months which resulted in a separated collarbone because a car decided to sneak behind another car at a stop sign and thus blew it and caused me to slam hard on my brakes to avoid getting run over, I'm okay with enforcing the law.

As it is, I'm always irked by riders who are coming towards me on the wrong side in opposing traffic and there are plenty of very silly riders out there who blow lights and whatnot oblivious to the almost accident that occurred as they passed nonchalantly by.