I'm sure others have had their minds clarified at The Old Course but I've never had that opportunity. For me the moment of clarity came the afternoon I played a few holes at Ganton. Now I know why bunkers are important to a golf course.
I've always figured that "sand traps" were a holdover whose place in the game was assured more by historical contingency and sentiment than by their necessity to the course's design. But now that I've seen my first Well Bunkered Course (tm) I know how perfect a hazard they can provide, especially in a fair breeze.
The bunkers at Ganton are plain (not to say ugly), functional buggers of a style that I'm sure would gain absolutely no "bells and whistles" points with a Golf Digest rating panel. Their sand is buff-colored and actually filled with all sort of irregularities, bits of shell and the like. And they are pretty low profile when seen from any distance away. But they do the job and they
will be taken into account when you play the course, either before you hit a shot or when you hit a recovery.
P.S. And I realize this epiphany could have come on any of dozens of great golf courses, especially in the UK and Ireland. Mine just happens to have happened at Ganton, although I believe the brilliant greenside bunkering I experience the day before at Seaton Carew prime me for it.