That depends tremendously on where. Historically, bike lanes were quite often entirely in the "door zone" - or even outright obscured by parked cars. It's still by no means universal, but cities are increasingly painting better bike lanes.

"cyclists should consider themselves drivers of vehicles in traffic. That means obeying the rules of the road, because when all drivers obey the same rules, they don't have collisions. Forester explains why cyclists should not be afraid to cycle in traffic, and he urges them to resist being shunted off into government-sponsored bike paths as if they were incompetent children."

You've never been outside of a city, have you?