When I got my 32" I initially figured it was too big. I was moving my head a lot, and getting a stiff neck for it. However, a week or so in and I stopped moving my head and it's been fine.
However something this large? yeah, that's not good. And I bet it doesn't do your eyes any favours either if you sat up close to it. So you move 5ft back? may as well be sitting closer to a 27" IMO.
I have a 65" TV which sounds terribly exciting ! however, when you are sitting 15ft away from it it's not even as good as gaming at a desk on a 32". However, it is considerably more comfy so there is that.