Not true, but close. (Although I will slow greatly but roll through on my bike, but only if I am not disrupting anyone else by doing so.) I abhor those who blow through stop signs at full speed in my residential neighborhood where there are kids all over the place. Your time is not that important! And don't get me started on the "stop lights are optional for cyclists" crowd. I have had numerous near misses as a pedestrian when crossing with the light.
Also, I am glad that JC's youngun is keeping him honest in the roundabouts. Those things are much more efficient if people are signalling their intention when leaving so other drivers are aware when it is safe to enter. If used properly they are much more efficient and quicker than 4 way stops. I have one a block from my house and
I swear I'm the only person who ever signals when leaving the thing.
Wow, that blew up to a rant...