I can only speak of what I experience. In my part of 2D I have not seen any noticeable herd reduction. I do some hunting in 2A and I see enough deer to make it worth my while. I do not know what it was before HR, but its ceratinly not hurting where I hunt.
While not hunting, I do go camping & hiking around various parts of the state, typically state forest or Nat'l forest. Some places I see no deer, but also see no good deer habitat. Some places I was actually shocked at the numbers of deer I saw because I heard things were so bad.
I still see FAR more deer and deer sign in PA than I do in Ohio.