Mr. Mucci -
If you include heather & gorse in the category, you are now comparing apples & oranges. To the best of my knowledge, neither heather or gorse can be found at GCGC, NGLA or Shinnecock. Am I mistaken in that regard?
Based on playing 25-30 links courses in GBI, my best guess is that heather (which only grows ankle high by the way) is rarely found on any links course there. It is far more common on the inland courses in GB&I.
In fact, aside from some of the links courses in Scotland, there is much less gorse than one might think. I have seen little or no gorse on the 20-25 links courses I have played in England and Ireland (Birkdale, Hoylake, Hillside, St. Endoc, Portrush, Portmarnock, Lahinch, Ballybunion, etc.).
Of course, there is really not much of an option if you have hit your ball into a gorse bush. In almost every case, you have to declare an unplayable lie and take a drop. Recovery is rarely an option.
DT