No, you're right, I am saying it is destabilizing for a country to have more than one currency. It does weird things to culture.
Look at why Europe is so messed up right now - they adopted a single currency without a real government to match. Much as I might not like her, Margaret Thatcher was right when she said that "single currency is a federal Europe through the back door". It's either that or big trouble down the line.
I see you're from Denmark, so think of Legoland (in Billund, I assume you've been - it's silly!). Yes, they take all kinds of currency there, but it's very isolated and localized. At a broader national level, there is just the (sic) kroner. I've never once paid with US dollars at a pølsevogn in Copenhagen. :)
The full argument is quite long, but at heart, yes - I believe that the gold standard was a bad idea and remains a bad idea. Going back to it will not solve any of our current economic problems, it's a waste of time.
Thanks for sticking with the conversation btw! It was fun. :)