As a well-traveled cyclist, I yearn for the truely separated roadways my peers ride in other places. In Holland, for instance, their cycletrack treatment is closer to a special sidewalk for bicycles than a repainted stretch of highway. Each mode of transportation (walking, riding, driving, mass transit, etc.) has its own path. This separation of concerns (segmented by both mass and speed) makes getting around safer and easier for everybody.
The thing that San Francisco has and Amsterdam doesn't is private garages in most freestanding buildings. For instance, the northern-most section of the Wiggle has the city's most protected bike lane - there are cement planters separating the bike lane from fast-moving car traffic. Unfortunately, to support private garages, there are gaps in these planters enabling homeowners to enter/exit their driveways. Delivery vehicles and private cars frequently idle in the spaces between these planters, trapping cyclists in the bike lane and forcing them to merge into car traffic that isn't expecting them.
The city does nothing to stop this, and the drivers are incredibly hostile. I've tried getting off my bike and asking people (as kindly as possible) to move, explaining how parking in the bike path puts me life at risk. The nicest response I've gotten was being told to go fuck myself: even the old man in a bus driver's jacket idling in his car was shockingly violent in his reply. Delivery drivers don't give you the light of day. There's a tow company on this stretch of the Wiggle that frequently has trucks blocking the path. I noticed someone had parked to deliberately keep the path clear one day and earnestly thanked him for doing so. Even he threatened me.
San Francisco politicians respond with platitudes everytime once of us dies, but they do fuck-all to actually protect us. Our local transportation board reimagined one neighborhood street as a promenade, prioritizing pedestrians and cyclists and creating a destination for people from all over the city to come patronize local businesses. A handful of shop owners who came of age when the car was the dominant form of transportation raised concerns about parking. Rather than pointing out the plentiful parking on literally every nearby street, offering to construct a garage, or pointing out that users of all forms of transportation would flock to a human-scale shopping district in numbers that more-than made up for the lost parking, the city caved with the mayor scuttling the whole project.