I've only flown once in the US, in a mate's aircraft from Connecticut up to Vermont, then back down over the area you mention. I agree as I was also struck in many parts by the forest cover etc. However, I also noticed that there were many many more bona fide airfields around, so my overall impression was that for most problems, such as wx or rough running, there would be more choices around than in many other places.
I understand from friends who fly at home in Australia, where they have both a lot of bush and relatively few airfields, that the choice often comes to letting down as slow as you can in the tree canopy... it will hurt and won't be pleasant, but they can absorb a lot of the energy and this can be survivable.
I also understand that golf-courses and beaches in coastal/urban areas are often considered for forced landings...
Still, I think we have it realtively easy in most parts of our relatively benign UK environment in this respect.