The bus system is especially critical to this. It doesn’t take billions of dollars to add a new bus route, or make buses more frequent on a route, so congestion issues at bus stops are largely addressable. The routes are also generally being made more convenient, so the added benefit of driving in a car is diminished.
I live in New York now, and while the subway coverage here is certainly unbeatable, its unreliability, dirtiness, congestion, and the borderline-criminal mismanagement of public transit infrastructure in NYC (including buses) make me really miss living in Seattle.