When I went to the UK in 1982, there really wasn't a ranking of the courses there to tell me where to go. I had to use all kinds of other sources:
1. Looking up the courses Bernard Darwin had written up in 1910, to see what had happened to them
2. Seeing the courses that had hosted championships back in the day, but no longer
3. Searching out courses by noted designers [Colt, Simpson, Fowler, Abercromby, Braid, etc.]
4. Going back to the golf magazines of the 1920's and seeing what holes and courses they talked about. A list of the favorite holes of Sir Ernest Holderness [Amateur Champion in 1922 and 1924] included Dornoch, Pennard and St. Enodoc . . . that was the first mention I'd seen of the last two.
5. Most of all, wherever I was, I would ask the local pro and the people I played with what other courses I should see in the area.
Today, guys will drive right past Gullane and Kilspindie and even Deal, and all the way out to Machirhanish instead, just to get to the next course that made the list. [And don't get me wrong; Machrihanish is a lovely spot.]
I guess my problem with the lists [like with all sports halls-of-fame] is the arbitrary cutoff: you're either in or you're out, so then people start making up all kinds of silly rules to decide where the line should fall. [And, of course, whether they are one of the Important People who gets to decide who's in and who's out.] Whereas in reality, everything exists on a continuum: no, Gullane and Kilspindie are not one of the top 100 courses in the world, but they are full of great golf and a blast to play.
I just did my list of my ten favorite rounds of 2019, and my round at Kilspindie was #1, ahead of Muirfield, Crystal Downs, and Tara Iti, among other places. Some of that was the company, for sure, and a beautiful day to boot . . . but some of it was pure relief at not having to worry about how I should vote on it, leaving the strict imperative TO GO OUT AND PLAY. And you can enjoy the hell out of that experience at many, many more than 100 courses.