First, one has to buy into the notion that the best golf course in the world is identifiable.
Then, one has to buy into the notion that at any given point in time the best golf course in the world is within the range of whomever is doing the ranking/rating (Your foray into the Himalays, as an example, Tom).
Lastly, one might have to accept that the best golf course in the world has already been built and may never be supplanted.
The Groupthink, and I agree that it exists, is an exigent that we need a meaningful start in order to rank everything else. Ordinal numbers only work if there's a first place in the first place.
Without the Groupthink, every list would be a personal list of personal experiences.
I recently finally listed all the courses I've played and gave them a rapid rating. The distribution here is largely normal with only 10% of my courses receiving the highest rating and another 10% getting the lowest. Median, mean, and mode are all the same.
Does this imply a ranking as well? How do I parse the 9s/8s/7s that litter my Top 100? GroupThink is a good a start as any for me to determine that the 9ness of Merion East is better than the 9ness of Old Town Club.