That seems like a dream environment for these cars. They are very good about waiting for humans to cross. To be honest, a Waymo at the front in an intersection means that it's going to be much more relaxing as a pedestrian or bicyclist crossing. This is especially true in intersections with a no-right-on-red where Waymos will obey but human drivers in San Francisco rarely do.

Waymo has no problem navigating the narrow streets of SF.

Every town says the exact same thing when Waymo shows up, and it's never true. There's nothing unique about Portland drivers, streets, sidewalks, or pedestrians.