On the other hand, like TOC, I have seen how Seminole tends to grow on those players who pan it at first---maybe not all but a lot of them, so I just think this is an interesting subject and it's why I like to hear Michael Whitaker's tour pro friend's specific take on it.
Tom, I have a theory on this (though I'm obviously guessing with these particular courses, as I haven't had the pleasure).
Many great "classic" courses are more subtle in their defenses than most modern courses. As such, it may not be obvious which side of the fairway to favor, when to attack a certain hole location, where not to leave an approach shot, etc.
If you don't play there frequently enough, and especially under the right conditions, you might get away with something and not even realize it. Or you might get penalized and think it was your shot, rather than your (lack of) thinking.
Conversely, if you are fortunate enough to play said courses frequently, you start to feel more pressure on your drives, approaches and putts, knowing what is at stake, and you start to think more during your round, and, consequently, think more highly of the course as a result.
I think subtle classics - and likely also subtle moderns - will always suffer in the eyes of the non-frequent players.