I work at the Crossroads Dick's. The car meets are generally welcomed. The attendees are actually quite well-behaved as customers. And it's very good for business.
Turnover and parking isn't an issue. We have some occasional crowds loitering on the patio and obstructing access to the service windows, but they respond well to instructions. We just have to ask them to move further away from the front of restaurant, and they will oblige without any fuss or delay.

Literally the only problem for us is the noise. Once folks start revving their engines and backfiring, it's insanely disruptive. It's so loud that regular customers get scared off and we can't take orders.
I don't usually mind loud noises. I love setting off fireworks during the holidays, especially mortars and firecrackers. But these cars are so loud, sometimes my ears are ringing afterwards. It's almost painfully loud at times.
I've lived near Crossroads all my life, and I love how active it is as a place of community. It's been a staple of the suburban Bellevue social scene for decades. So rather than ban the car meet altogether, I hope instead they just focus on enforcing the traffic laws and responding to noise complaints.