Don,
Very true. It is a form of creativity to "see" how certain elements can combine into something else, which is not that much different than golf design, or for that matter, music, comedy, art, etc.
In GCA, in many cases, we see a situation, like pond left, and start applying possible design concepts we know from the past, and end up with something like a Cape Hole, for instance. Or something else. We combine several common elements with perhaps one unique one to craft a solution (and unique design) to a specific piece of property.
But Ross is right, too. The design process is similar to the scientific process - ID a problem, look at alternate solutions, pick the best, refine as required (including, sometimes starting over under a different premise found to be better)
I believe many participants here don't see the value of that process, and in some cases, great architects like FLW, market themselves as "Master Architects" sort of able to see things as a whole. But, in reality, most of us have to break the design down to several different and smaller parts to solve the big puzzle first (routing) and then a series of smaller puzzles, such as greens, tees, fairways, each of which is really a separate design problem. And most design problems involve some kind of compromise of "give this to get that."
And, the things that go into a good design - drainage, circulation (especially with carts), maintenance, etc. go far beyond simply saying "a bunker would be nice here." The nice bunker thing is about 10% of the total thought process!
And back to the OP, yes, each of those features can be greatly quantified. Does the green get enough sunlight to grow turf? Big enough to withstand traffic? Enough areas to move good cup locations? Ease of walk on from front (walkers) and side (riders). Is it visible to golfer? Does the ball react "correctly" (whatever that may be) when it hits the green? While each green varies in the degree in which they meet minimum functional needs, most would say they have to meet a lot of them to be a good design.
And, that is all before the golfer even weights in with a "I just like it for some reason" which will always be the last thing we can quantify, under, perhaps, the saying of "There is no accounting for taste....."