I'm the same with my 58" - still impressive, yet it no longer has that "Wow, it's big" feeling. It's now 'adequate'.
At least with larger sizes they give you some versatility where you can sit. Some like to sit on top, others like to sit far away. I sit anywhere between 5-12 feet away; usually 7ft, because that's what's comfortable to me.
(As an added bonus I can also watch the TV 30ft+ away from outside the door whilst having a cigarette. A pipe dream with my old CRT