Paul,
I agree on variety. One of the best things about natural slopes is the randomness. It is hard for designers to vary things to that degree. I recall telling a shaper to make a grass hollow like a big old barrel chair. Liked it, and the next trip, every durn area looked like a barrel chair. Shapers and archies just cannot provide the variety nature usually does. On the other hand, they have to consciously try, and a formula to use backing mounds, or any other feature gets noticed, probably because nature wouldn't randomly place mounds like that time after time (well, in most cases)
I am also reminded by some of the photos of old linksland, that the idea of mounds must have originally been to convey some sense of the dunesland, but as one gca put it, those are "puny strivings" because even today, with the exceptions of perhaps Whistling Straits and Shadow Creek, we cannot emulate nature's scale.
That said, so many responses are feature based. My thoughts are that in general, people understimate the amount to which our entire landscape is "organized" for human consumption and use, and how much I believe the average guy actually has come to rely on that organization (via landscape architecture mostly) to feel comfortable.
Or, more specifically, there are very few opportunities like golf where the viewing sequence is so controlled and predictable. In some ways, its a shame not to try to maximize that, by leading the eye, varying the spaces, and even throwing in the occaisional surprise. In those ways, design really should be able to improve the golf experience, if well done, no?
The only reason to tout maximum naturalness is if it enhances the user's experience while using the facility. Often, nature does that, and it makes most sense to change the landscape as little as possible for the given use (in our case, golf). But, if nature needs a little help now and again, there is no reason not to, is there?
Lastly, I use the term "sincerity" in design. Given that we must alter the landscape to some degree, I often take the middle ground - alter it and make no apologies for it, that is, building a green or bunker support. If all the factors in golf and the landscape say we need a bunker out there, then I see no reason not to just put in just enough support fill to build that bunker.
Sure, I could add a bunch of support fill to try to convince the golfers that there was a natural hill there that we just carved the bunker into, but what exactly is the point? Again, the "puny strivings" thing comes into play. In practical terms, we probably need to strip all the topsoil the length of the hole and move loads of earth in an attempt to make a small area of altered contours look like it was part of something bigger. Why be less natural in an attempt to look more natural? Isn't it more "sincere" to admit we are building a golf course and need to add bunkers, so just do it the best we can?
IMHO, yes. Let the feeling of nature come from the trees, the grass (not at all natural in some areas, BTW) and the fresh air. And let the golf course be a competition field, not a meadow or arboretuem.