Bike lanes don't just compete against car lanes. They also compete against sidewalks and bus/tram lanes.

There is also the question of what you are going to do with your bike once you are at your destination, where are you going to park it?

For those who went to Amsterdam as a pedestrian, I don't know how it felt, but to me, it was not great. Lots of narrow sidewalks littered with stuff, the stuff in question is often bikes, so you have to step onto the adjacent bike lane, where you are usually greeted by an angry cyclist, because for some reason, parking your bike on the sidewalk is fine but stepping on the bike lane is not.

So, as a pedestrian, I wished Amsterdam converted its car lanes into trams and sidewalks rather than bike lanes. And yes, I hated bikes for as long as I stayed in Amsterdam, and so did everyone in my group.

The cars vs bikes debate tend to get a lot of attention, but the bikes vs pedestrians and public transit aspect matters too.

Note that bikes + buses can be a particularly dangerous combination. Buses are long and can block off the path of a careless cyclist as they turn, who may fall right under the wheels of the bus.

> eliminate a lane of traffic and/or parking spots

It's out of the question in most places, it slows car traffic down and makes it harder for people to park in places where parking is already scarce. Then residents and customers of local businesses have nowhere to park.