You know, as an American, I never liked coins much, for all the reasons silenus and carnivorousplant and others have mentioned. To be clear, for me isn’t the weight, it’s the inconvenience of having coins floating around, especially when mixed into my pocket with cell phone, keys, a pen or two, etc.
I don’t spend them much, either. I always feel kind of embarrassed standing in a checkout line searching through my pocket for the exact change, even if no one is behind me. I just about never buy anything from a vending machine. And in any case, as people on both sides of the argument have mentioned, in the US you need a bunch of coins to pay for pretty much anything (dollar coins excepted, but I just about never see them).
So I usually dump my coins into a jar every few days and be done with them. And I trade 'em in from time to time at the supermarket (and because I get an amazon card with them I get full value).
But I always figured that higher value coins would be more useful. If we had a $2 coin, I could use couple of them, instead of 16 quarters, to buy a fast food meal. If we had a $2 coin, I wouldn’t have to get out my wallet, etc.
Then I went to Europe earlier this summer, where there are 2-euro coins and 2-pound coins. And you know what? It was awful. My pocket very quickly reached the point where I couldn’t get anything out, just like in the US, only this time the coins had actual value–at one point I had something like fifteen euros in my pocket–and so I really needed to use them in cash transactions. And it was really difficult to find the correct value that I needed. Much more difficult than opening up my wallet and getting out the bills.
Can’t speak for vending machines, but where cash checkout lines were concerned, there was no question that they move more quickly in the US than in the coin-heavy parts of Europe I visited. Sure looked like people were having trouble finding the right coins they needed… (and btw I am NOT a person who thinks everything is done right in the good ol’ US of A).
So from where I sit there’s good reason not to go to coins instead of bills.