I live near Atlanta. It has been dubbed the "city in a forest", as there's about a 50% tree canopy.

Other than the pollen, people killed and power outages caused by falling trees, and dealing with loblolly pines (they are basically 80 ft/20 m tall weeds) they are great.

That said, it only works because Atlanta had mostly low density housing. For instance I have a suburban tract house with around 20 mature trees. As the housing density is bumping up, we are losing tree canopy.