I guess this is more on the subjective side of things, as I am sure some people do feel that way about the relationship between cars and wilderness.
Frontierland was always my favourite land in MK mainly for the calmer atmosphere, and especially the effect at night with the music, dim lighting, water, and trees which added some respite when crowds and temperatures dipped. Adding cars to that equation subtracts from the appeal to me, in the same way that Grizzly Peak would be far less charming to me if there were cars zooming all over the mountain in place of the rapids ride.