Earlier quoted context omitted.
According to Wikipedia, the Idaho Stop has not been adopted outside of Idaho. I believe many jurisdictions allow bicyclists to proceed through a red light if they stop and wait for a minute or two and the light doesn't change, as a way to compensate for sensor-activated lights that bicycles won't trigger. But that's quite different.
Ah, you're right. I believe it's spread unofficially, though, because I've heard about the practice from several areas of the country.
It seems pretty common. In general, the law around cyclists and how cyclists actually behave is pretty different. And I don't mean to blame the cyclists there. In many cases (like IMO this one) the law is in the wrong and should be changed. In others (e.g. blasting through red lights without even stopping) the cyclists are in the wrong. But making the law better conform to reality here would probably make enforcing the good parts much easier.