Matt Ward,
I think it's safe to say that golf follows heavily populated areas, ergo the abundance of golf courses in the Met area.
Florida has pockets of populated areas, and those areas have their share of good golf courses, most of them older.
When a segment of the heavily populated areas in the Met area decided to winter in Florida, golf followed, at resorts and residential communities, but, I don't think those wintering or vacationing in Florida were looking for the severe tests they left behind in the north.
Those migrating to Florida, seasonally or on vacation, tended to be the older segment of the membership, not young bucks looking and yearning for a back breaking challenge. In addition, I'd venture a guess that with all that time on their hands, more and more womaen began to play golf at those resorts and residential courses, hence, a less challenging design was prefered.
However, when you segregate resort and residential clubs from private clubs in Florida, I think the courses at the private clubs are a notch, or two or three above the courses found at resort and residential communities. Doral might have been THE exception.
Hence, I think you have to make the comparison on a private club to private club comparison.
And, you have to consider the population densities of the areas considered