I've got kinfolks in Perry County, PA.
The places they hunt are wooded mountainsides with farm fields in the valleys. None of it looked that thick when I saw it. The woods are big hardwoods and the hot zone is the woods near the edges of the big fields. I haven't hunted it myself despite many invitations but they always kill plenty of big deer there.

I didn't see any areas of the real thick stuff like you describe.