In my experience in midwest suburbia the center line is almost always dashed unless there's poor visibility (seeing around a tight curve or over a hill) or more than one lane of traffic in each direction (eliminating the need to overtake in opposing traffic). Or its a pedestrian zone, with reduced speed regardless.

True, some people break the laws. I don't see it nearly as often as you claim to, and usually not in especially unsafe conditions, but the point stands that those people are selfish and impatient. I don't see why bicyclists should have to sacrifice either their freedom (to bike to where they please and utilize existing public infrastructure) or their safety (by leaving the illusion that a full size vehicle might squeeze by at cruising speed) for such people. It's not bicyclists' fault that the infrastructure fails to serve all of its users equally.