@29 "The pressure-sensitive lights are not geared towards cyclists"
I don't blame you for not properly understanding this subject. Most people aren't even aware of intelligent stop lights, or if they do, they have some vague understanding of how it works. There really should be a better PR campaign by SDOT to teach cyclist to properly use these stop light changing systems.
Here is a great article on the subject and how it applies to us cyclists:
TL;DR is just put either your front or rear tire on the little "T" at most of Seattle's intersections (look for the edge of the circle in the pavement). This will cause the electromagnetic (not pressure) sensor to detect the existence of your bicycle. This should really speed up the wait at most lights and make for more legal ways to proceed through a stubborn stop light.