"Hard money" types tend to denigrate the dollar as little green pieces of paper, not a real thing that's actually worth something. This seems to me like a version of the Marxist fallacy, the belief that value can be somehow intrinsic rather than relative. Gold is pretty, of course, but not actually much more "useful" than a dollar bill. It does have some industrial application, but the vast majority of the gold in the world is used for money or jewelry.
A dollar is a real thing: a store of value and a medium of exchange. These are extraordinary valuable uses. Indeed, the need is so great that if currency is restricted or unavailable, people do not simply revert to barter; they turn something into a currency.
John Kenneth Galbraith amusingly recounts what happened in the American sector of occupied Germany, where the money supply was deliberately kept very tight by the economic planners. People immediately turned to cigarettes, which were valuable to the Americans for smoking, but to the Germans both for smoking and for substitute currency. The result was that the Germans scrounged even tiny cigarette butts, which were the equivalent of spare change. Hence, when some Army sanitation engineer posted a sign in the men's room saying "Please do not throw your cigarette ends in the urinals", some wag scrawled underneath it, "it makes them soggy and hard to smoke."