I think there's something to be said about gold's utility as money. It's remarkably good at being money compared to other materials. It's easy to store, identify, divide, it's fungible, and it's scarce enough. If civilization were to collapse, I think that there's a fair chance that we'd be using gold and other precious metals as money again, whether or not it was used in the past.
I'm not sure I believe that. If civilization were to collapse, you'd want food, medicine, potentially gas. Potentially solar cells, and some other things.
I think you'd see more traditional bartering than money being introduced again in its earliest stages.
The problem with bartering is that useful but rare products are a poor store of value because peot need to use those things. Useless but rare things are better as money, as long a users are confident that there is economic growth to spend money on (decoupling consumption from production)
If gold was no longer wanted for investment, its value would go very close to 0, despite utility to industry. Why? Because there's 190,000 tons of it, most of which is being held as an investment. If it wasn't needed for investment any more, then all that becomes available for industry, and now supply absolutely swamps demand.
Jewelry demand wouldn't help, either. If the price of gold went to 0, how much would be used in jewelry? Sure, it's pretty, but being expensive is part of the point.
I think the tensile strength/density might make gold transmission lines a bit crap. Maybe steel core with a gold outer where the AC current flows, but not sure if it would actually be any better than aluminum.
Plenty of applications like transformers where mechanical stress is a non issue. Corrosion resistance is another useful feature that can be applied to a wide range of use cases.