It still alarms me that some folks view Deal as a "flat"course. I realise in this instance we are talking about flanking dunes, but keep in mind the sea wall is no higher than the original frontal dune. It was simply solidified and had low points raised to the predominant height to keep the sea out (as relayed by two long-term members).
As far as a fronting dune goes that is far from flat and the dunes around 3, 4, 5, 6, 15, 16, 17 and 18 are significant. That's half of the golf course!
As for contours in the fairways, I think it is taking the term to a pretty big stretch to describe what's happening in the 3rd, 5th, 15th, 16th and 17th fairways as "micro-undulations". There are parts of the 3rd, 5th and 15th fairways that rise much more steeply at times than 1:1 to a height of up to 20ft on the 5th, 15ft on the 17th and 8-9ft on the 15th. Elsewhere are steady "swells" of 6ft.
I think one thing we do when we seek to pigeonhole courses is dilute the accuracy of our descriptions.
I think what we see within Deal as an example is instant enjoyment and appreciation of such holes as 3, 6, 15, 16 and 17 (and rightly so) where the dramatic land is located, and a much slower burn at the likes of 1, 2, 4, 7, 10, 12, 14 and 18, which are all exceptional holes in their own right.
Simply, I think the overwhelming hit of the sensory overload that massive dunes, the sight and sound of the sea, skylarks and gulls and links shotmaking brings is what flicks an immediate switch at some sites and not others.
The satisfactions of subtlety take longer to make an impact, but when they do it is just as satisfying. I guess that brings me back to the very good point Ally made in the OP that on a "hit and run" tour you sometimes miss out on earning that intimacy with the more subtle holes and courses. I find that even if I think I can identify with my head in a single play a hole that seems to possess those qualities, I can't really feel it with my heart, no matter how hard I try. That takes time.