I am. As a medium of exchange (buying things, sending people money), I only use USDC which is pinned to the US Dollar.
For sending money to friends in other countries, it is so much cheaper, faster, and more reliable than the traditional money-transfer options I had before.
For buying things around town, I have a debit card that draws from my USDC wallet. Currently, it's less convenient than my credit card, because I have to keep that account full enough to be used, and if I need to fill it up in the moment, it takes about five minutes to jump through all the hoops necessary to not incur any fees. But, as an early adopter I don't mind. Fixing that UX isn't the kind of thing that requires a major technological breakthrough.
USDC operates on multiple layer-1 blockchains, for example Algorand. When transferring USDC between Algorand wallets, the transaction takes a few seconds and costs a small fraction of a cent. Compare that to the shit show that is Western Union, or Small World Money Transfer, or wiring money between non-cooperative banks.
I also own ALGO coins. I could use these as a medium of exchange as well, but I don't, and it would make less sense to do so. Instead I think of these as stocks. Their value fluctuates with the market, and they allow me to vote in Algorand governance voting sessions. If I wanted to liquidate these assets, I would wait until the price went up and then convert them to USD or USDC. I wouldn't spend them with a debit card any more than I would spend stocks with a debit card.
Of course there is an additional use of ALGO's as a medium of exchange - transaction fees for executing smart contract transactions. I haven't found any compelling dApps yet, but in theory this will become another primary use case.