Mike-
(My apologies for the rambling nature of this post. I have been interrupted exactly three thousand times while trying to finish this.)
I think it is perfect that you have selected in your example two holes on a course that the good doctor designed. IMO, he was a master of enticing the golfer to gamble on a true risk/reward hole. The lure of attempting to reach those two holes in less than regulation is almost unbearable. People talk of how good Pete Dye is at getting inside the heads of good golfers - and he is - but MacKenzie was terrific at it too.
The temptation is impossible to ignore. As you point out, on those two holes the peer pressure is enourmous. Standing on the tee, the player knows he must perform on the first shot, to have the opportunity of an eagle or birdie. (As an aside, this is where the abominable addition of rough to ANGC has had what I consider a terribly negative influence on shot selection. If you notice, with the addition of rough, players who mis-hit their first shot on these holes are no longer even TEMPTED to take the risk. Like any good little disciplinarian master, the course set up makes the decision a non-decision. Before the rough was grown, the peer pressure was so enormous, the enticement so great, many players would still make the decision to go-for-the-green. This made for thrilling golf that has been lacking IMO since the changes.)
Those two you cited are excellent examples of good design that helps blur the line between the approach of match play versus medal. By making the reward attainable by so many, the high risk is hard to avoid. My guess is even those who don't know GCA, could explain some of the less obvious design characteristics of those two holes: shaping the shots, why a layup is still no bargain, how the contours influence the movement of the ball, etc. In fact, one of the other reasons why those holes are so enticing is the relative danger still present in the layups and subsequent approach shots.
Regarding your observations about golfers outside of tournaments and the decisions they make, I often notice golfers confusing the distinction between strategic design and strategic course management. Whereas the observant golfer will make course management decisions based upon the option presented by, and the risk/reward offered by strategic design features of the course, by its nature strategic design welcomes poor decision making (course management). Free will reigns.
I have heard some of my playing partners refer to certain holes as "strategic designs" when in fact the playing of the hole is not really strategic at all. One hole in particular is a par 4, forced layup, approach shot across a small pond. I think in their minds strategic design is any par 4 or 5 hole that forces them to play their tee shot with any club other than the driver.
On the recent telecast, Curtis Strange made some comment about a new bunker at Westchester being more of a directional bunker "telling the golfer where NOT to go." I found that line confusing at best. Is this the role of bunkers in strategic design? This bunker sounds like it would fit more easily into Penal Architecture from a philosophical perspective. In strategic design the hazard should play the role of Siren, hynotically tempting the player, not dictating a course of action that must be obeyed.
I guess this is a rather lengthy way of saying that the golfers you observed were making decisions (course management), that were risky, because they were seeking the thrill, and approaching the holes from the "spirit of adventure" without regard to the consequences. Since I don't know this course, I can only make a guess. From your description, it sounds like it was lacking in the srategic design features that provide a thrill. I guess my question would be, having taken the smart approach the course dictated, was it a thrilling round for you? I think the need for excitement, and sporting adventure is deeply rooted part of most golfer's nature. If we can't find it, we'll manufacture it. And this probably applies equally, whether the round is one of match play or medal.