Traffic is really horrible in Atlanta but I was able to plan around it so that it didn’t bother me much. But I would never think of distance against rush hour unless I had a specific reason. So while it may suck to drive during rush hour to get to a park, just don’t do that. Traffic is dead at 6am and is fine until 330 or after 7. Even a block from Piedmont park, I don’t think I ever went there except mornings, evenings, and weekends. This is different from other cities where there’s just no getting around traffic.
Living in midtown (or anywhere) without a car is hard, but there’s lots of cities that also require cars but don’t have so many parks and outdoor stuff.
There’s definitely a car culture and that’s a downside, but there are lots of parks.