There are some of us who think places like the blue hole are more than scummy ponds. Their legacy is not just the cultural aspects and the resultant folklore. The blue hole is a relict from the pleistocene era, when the last wave of glaciers was prominent (11,550 to 1,800,000 years ago). They are (or were in most cases) strong springs during periods of intense cold. The constant water issuing from them created many braided channels downstream by their high energy discharge. The "scum" you see is a type of algae. I see many smaller "blue holes" in my ramblings, including the large one in Mount Misery and smaller ones along Cedar Creek. My interest in the pines is a bit less the human history, and a lot more the landscape and natural features. Very neat geographical features.
I guess I can understand why to the rest of you its just a "scummy pond". You were probably influenced by the stories and folklore (and the wow factor), and when you finally arrived expecting to be entertained (like at a movie theater or Disneyland) but were not, you felt cheated.
Most of my information comes from a Master's Thesis by Mark Demitroff; "Pine Barrens Wetlands: Geographical Reflections of South Jersey's Periglacial Legacy"