Peter...
I think you make a good point. And I think your idea of people comparing and contrasting isn't limited to golf courses. Don't human beings do it (judge) with every thing? Cars, women, houses, clothes, handicaps, etc.
But I will add one more point, I think this madness does have some value. And I think that value is finding better golf courses, perhaps at better prices.
On this site, and perhaps everywhere, people love to talk about Pebble being over-rated. Cypress is better than Pine Valley. Etc. But at the end of the day, all those courses are amazingly good. So the value in those discussions is there, just not at a massively high level. You mentioned Plainfield. I gather that is an amazing course. We can argue that it is under-rated like the others I mentioned and I would suspect it is.
But here is the deal, looking, analyzing, discussing, etc...can lead to some real finds. Longshadow in my neck of the woods is the perfect example. It is a truly high quality golf course and can be played for $50ish. But hardly anyone knows about it in Atlanta. They'll pay $250 to play Great Waters (which is right down the road from Longshadow). They'll pay $100ish to play Cuscowilla, which again is right by Longshadow. But they drive right by Longshadow. They'll drive to Bears Best and pay $125ish to play, but haven't heard of Longshadow. They are missing the boat, plain and simple. And if people with "breadth of experience" say good things about it, perhaps others can enjoy it.
I am sure there are other gems out there that people are overlooking. Our discussion and comparing and contrasting just might lead to a few more gems being enjoyed by others.