I am biased but why do we even need cars in the city center, or at the very least why should they be convenient? Could there not be a situation where you walk to the edges of the city center to pick up your car and leave from there? There are specific accessibility concerns that certainly need to be accounted for, but the idea that the average driver loses 20 minutes on a trip that should be 5-10 minutes doesn't seem like inherently an issue in this context.
edit-add: biased in the sense that I really dislike cars and live in NYC in large part because you do not need one here
edit-add: biased in the sense that I really dislike cars and live in NYC in large part because you do not need one here