But certainly, people wear gold, and electronics and various other industries use gold for its amazing maliability and conductivity.
Minor nit-pick, gold is actually not a great conductor, it's prized property is that it doesn't generally corrode, that's why connectors are usually gold plated, and not entirely gold. the plating keeps the corrosion at bay, and the underelying metal conducts better.
Gold is "valuable" for it's uses in many industries, including electronics, chemistry, and jewlery. People also drive the price up because they think it will protect them from a crash of fiat currency, but I don't really believe that people would revert to using gold if civilization fell apart, more likely people would barter for things of more immediate importance, food, shelter, heating fuel, clothing, etc. Gold would have relatively little value in such a society.