Jonathan:
I don't go around to see golf courses as a "feat" like some professional panelists do. It's been years since I counted up how many courses on the lists I've seen, but I just did, just for you.
I've walked 96 of the most recent GOLF Magazine top 100 in the world, and played 90 of them. (The ones I've never been to are Nine Bridges in Korea, Nanea in Hawaii, The European Club in Ireland, and Valderrama in Spain. I have no immediate plans to go to any of them.)
Of the six I have walked but not played, I've walked four of them 2-4 times each, and had a very good look. The only two that I've walked once only are Morfontaine in France (which I would vote for in the top 100 if they'd let us, and which I would love to get back to), and Whistling Straits (where my lack of standing to vote probably helps them).
I'm sure that the percentage of courses I've walked but not played is higher, the lower you go on the list of contenders ... if I've walked a course and didn't think much of it, I'm less likely to go back and play.
So, would those votes be of use to the GOLF rankings? My take is that they would be. There are still a lot of courses in remote places which fail to achieve a quorum -- Morfontaine used to be one of them, before it made the list and all the trophy-hunters were required to go. A positive vote from me might get them on the list so others went to check them out, or at least encourage the magazine to keep the course on the ballot and try to get more voters there. Ignoring my vote does nothing.