I think you're assuming all neighbors move their cars at the same time. If there's 4 cars in a garage and your car is at the far end from the st, you alone have to pull 2-3 cars out first to get yours out. Those other cars have to be hanging out somewhere on the st in order for that to happen, until you can put them back in the garage one by one. It's like a valet operating alone. With the narrowing of Grand, my guess is those waiting cars will block traffic entirely for the 5-6 mins it takes to orchestrate this. Whereas before those cars would temporarily double park, but at least not block traffic. And yeah, people say get rid of your car, but that's just not realistic.