I feel like I've lived in enough places and they're pretty small relatively speaking but whatever, seems like we'll see how it actually plays out.

I'm not saying it's going to randomly speed up to 80mph and crash into a building and explode. Just that I'll finally have a chance to witness those hilarious videos in person

This is a false blanket statement. Portland has very short (walkable) blocks, many one way streets, and it is true that most often than not cars actively stop for pedestrians to cross the street

One of my friends talks about this skate park on Stevenson st, which is a cobblestone road in San Francisco. It's ostensibly a two way road, but with street parking, it isn't really. Or rather, in order for two full sized cars to fit, one of the cars has to go up on the curb. Waymo's don't seem capable of doing this (yet, on that street), and jam up that road whenever there's traffic on it. Waymo's has problems with that narrow SF street and any amount of traffic on it.