It just so happens I've been computing the "attractiveness" of courses. This is the amount of activity they generate on DGCR in excess of what would be expected, based on the surrounding population. By this measure, Highbridge is the single disc golf complex that has the strongest drawing power: 33 times as powerful as the average course.
33.1 = Highbridge Hills, Highbridge, Wisconsin
19.8 = Flip City Disc Golf Park, Shelby, Michigan
15.5 = Glacier Point, Glacier Point, Alaska
15.1 = Lake Nacogdoches DGC, Nacogdoches, Texas
13.8 = Seven Pastures, Skagway, Alaska
13.4 = Mason County Park, Ludington, Michigan
12.2 = Sandy Point Resort DG Ranch, Lac Du Flambeau, Wisconsin
10.8 = Leviathan, Ludington, Michigan
9.7 = Whistler's Bend, Roseburg, Oregon
9.1 = Holler In The Hills, Brownsville, Kentucky
This thread seems to be more about cities to visit, so I added up the attractiveness of all the courses that share a city. Here are the top 25:
40.6 = Bowling Green, Kentucky
33.1 = Highbridge, Wisconsin
24.1 = Ludington, Michigan
20.6 = Charlotte, North Carolina
19.8 = Shelby, Michigan
18.8 = Nacogdoches, Texas
18.7 = Austin, Texas
15.5 = Glacier Point, Alaska
13.8 = Skagway, Alaska
13.6 = Flagstaff, Arizona
13.4 = Big Sky, Montana
12.8 = Moab, Utah
12.8 = Grand Rapids, Michigan
12.7 = Stevens Point, Wisconsin
12.5 = Brownsville, Kentucky
12.2 = Lac Du Flambeau, Wisconsin
12.1 = Roseburg, Oregon
11.7 = Tulsa, Oklahoma
11.3 = Traverse City, Michigan
9.4 = Huntsville, Alabama
9.0 = Spotsylvania, Virginia
8.9 = Rock Hill, South Carolina
8.8 = Appling, Georgia
8.8 = Kalamazoo, Michigan
8.6 = Red Feather Lakes, Colorado
Wait, where's Minneapolis? Well, the courses that list "Minneapolis" as their city don't include those in St. Paul, Bloomington, East Bethel, etc.
So, these are Mecca cities, not Mecca metros.
I suspect the ones in Alaska are more the result of a little bit of activity divided by almost zero nearby population.