I think this is great, but I can see it being potentially improved further if there was a temporary overlay of the physical map whenever you hover over a destination. Basically, I feel that completely removing the physical map is okay until you've picked a target. Then, having to click on it to be able to see what the route looks like (which streets to take, etc.) is higher friction than I'd like. Instead, imagine if…
It would be neat if they skewed the map to match travel times.
Imagine starting on the far south end of a congested city surrounded by a circular, relatively low-traffic highway. Points on the northern end of the city would be “closer” on such a map than points directly in the center.
You could certainly define a transformation that accounts for this, but I think it would necessarily defy most people’s intuitive interpretation of such a map.