Agreed, and those are essentially what I'm advocating for, but the vast majority of bike lanes aren't like that. I live in Portland, the most bike-friendly city in the US, and we have very few of them.

I would also say they aren't really bike "lanes" -- they're not a lane in the street. The Dutch call them "cycle tracks" which seems more fitting.

When a bike lane is separated from the street they are called bike paths. [0]

[0] https://en.wikipedia.org/wiki/Bike_path

For Bay Area HN folks: check out what San Jose has done with the bike lanes downtown recently. Separation from traffic using a combo of parked cars and barriers.