1. All value is subjective.
2. Gold has no objective value.
3. BUT, and this is crucial, that which is subjectively valued in a gold coin is INTRINSIC to the gold coin - its gold content. In contrast, that which is subjectively valued in a paper dollar is NOT intrinsic to the paper dollar. It is, rather, symbolic - contained in the symbols engraved on the surface.
4. The invention of money, which allowed massive division of labor and specialization in the economy, was one of the greatest inventions in human history. To trivialize gold's utilility is to ignore entirely that gold has, throughout history, been the world's choice for one of the MOST important uses to which any material can be put - money. And gold has been chosen for the critically important use as as money for some very specific reasons.
5. The only reason people stopped using gold as money was because they were forced at gunpoint.