It's not just pretty, it's also useful. Going back a couple centuries, there weren't many materials that were rust resistant and as malleable as gold. That combined with the aesthetic possibilities, and the fact that's rare and difficult to obtain, is what made it valuable.
You missed the coolest aspect, it doesn’t oxidize! To me that’s ridiculously cool. Also why it’s used for extremely important circuitry and such. Silver/platinum colored stuff looks better though