How many courses? Countless. I tried to write them all down once (from 8 years old to 42) and lost interest after 250. On the Classic GolfWeek list or GD, it works out to eight out of the top 10 and 18 out of the top 25. The Modern List is a bit spotty because so few truly great courses are being built in my part of the country anymore.
Tons of 6's and 6 1/2's in Northern California , but to crack the top 100 Modern is a tough road to hoe for any course.
Yet I wonder if there is a law of diminishing returns in playing a zillion great tracks. There are so many people I know who have played 50 or 60 of the top 100 and have ceased to learn anything new because they never play a golf course anymore unless it is "recognized."
Like movies, where seeing horrible films can be as much of a learning experience as great ones, golf may be the same way. Maybe it is closer to wine appreciation in that you begin with Boones Farm, move towards chardonnay and eventually end up preferring fine Cab's, red Zin's & Sirah's.
It seems to me that there are several stages towards enlightenment (or educating your pallette?):
Infancy: Public Muni player who cannot see the flaws in "his little mud heap."
Stage #1: Public player who honestly thinks Pelican Hill (or any decent CCFAD) is a great course. With no basis for comparison, in his mind it is!
Stage #2. First taste of something really special in the 2nd tier - SFGC, Creek, O-Club, Bel Air. This often coincides with the realization that the best clubhouses are found at places like Garden City and not "New Riche CC."
Stage #3. An epiphany at NGLA or Cypress or PV, where it all becomes clear. Here, the student begins to feel distain for average golf courses.
Stage #4. Been everywhere, including Scotland, England and Ireland. Seen it all from top to bottom and can articulate what he/she likes, dislikes and most importantly WHY.
Final Stage: Complete Golf Grok. The great wheel returns to infancy where the master can sense beyond the shortcomings of the simple muni, but grasp the grace, dignity and simplicity of it also. Like an art critic with a painting, he sees past the condition, cart girl and clubhouse and sees the strategies, line, texture and composition.
Call bullshit all you like. I've seen this over and over and believe this wholeheartedly.