Lots of BS here. Every car is a loaded weapon. Any door on any car can open at any time. OP gives fixie couriers the bad rap they deserve when riding faster than traffic, coming up on cars and passing on the right. Locking up their rear wheel for no reason at all without respect for other bikers following. All bad ideas. Glad we don't ride together.
People open car doors without looking...Fact! They do not turn their head to the left to look. You can't see them anyway.
Stay out of door zone period.