Not that this was a poll, but I went back through the responses and tallied them up. Here are the greens that got multiple, specific mentions (I did not include mentions of full course sets):
Old Elm - #4,6,7
Chicago GC - #5
Bryn Mawr - #12
Shoreacres - #3,10,12,13,18
Beverly - #5,8
Medinah 3 - #12
Ravisloe - #6
Olympia Fields South - #6,9
Flossmoor - #3,5,12,18
Interesting to note that no modern course in Chicago got multiple, specific mentions. Also interesting to consider how many of these greens closely approximate their original form, given decades of evolution.
That being said, if I were to take an architectural tour of Chicago courses and only look at the greens on the list above, would I be missing anything important, or would I be seeing the best we have?