It wasn't until my 1st trip outside the US (Taiwan) that I was shown how useless US coins are. In Taiwan, you can pay for an item with a paper bill and get change. Put the coins in your pocket and then use that to buy more stuff later.
Where as here, the only thing coins are really used for if in your pocket are making the amount even so you don't get coins back. So $4.08 item, if you give $5.08, you get a $1 bill back. So the $0.08 is benefical to get less coins.
In taiwan, I bought a can of coffee for 15 NTD and gave a 100NTD bill (the smallest bill). Got 85 back in coins and later bought a milk tea for 30. I still have 55 in coins left over. Bought some snacks and so on. At 1 point, I was actually thinking a coin holder would be beneficial as to not have a pocket of coins moving around.
The only thing I use coins here for is to put it in my coin jar. Then once it's full I have about $200-350 in coins. When I go to Vegas, I put it on 1 hand and if I lose, oh well. "Free" money. Most recent I was at golden Nugget and wanted to put the $287 I had from my coin jar on the bonus for 3 card poker. The dealer wouldn't let me as the max was like $50 or something. Well wouldnt you know it, I was delt a flush. So damn, I missed out on my $287 turning into over $700 (3:1). Instead I got $150.