Well, Joel, it just so happens that I am an obsessive record keeper about these things, in part because my former club insisted on trying to charge me for cart fees when I had walked. So, for 2009:
I played 141 eighteen hole rounds, walking 102 and riding 39. The vast majority of the riding was done at facilities or times where walking was not an option.
Just to highlight my OCD record-keeping, I only played 9 holes three times all year, but I went to the range 41 times; apparently, I'd rather practice than play 9 holes.
So, yeah, 25+ rounds seems to be a bit low to me. That may say more about the poor state of my mental health than the way the NGF categorizes golfers, though.