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Right. Gold has lots of practical uses and if it was valued according to them it would be worth at least as much as Bismuth at $25 per kg. But of course gold is $40,000 per kg.

Yes, but not at the time gold rose to prominence as a currency. In those days people needed mostly swords and axes.

Gold's not a great conductor. It's used because unlike copper or silver it doesn't tarnish.

And because it's shiny so it looks good in adverts.

This. Also, you can durably plate other metals with gold only tens-to-hundreds of atoms thick, so actual mass usage is kept very very small for these applications.