I saw someone write a check at a supermarket just a couple of weeks ago. I think it's the first time I've seen a checkbook in the wild in 5 or 10 years.
My landlord four years ago set things up so that the cheapest and lowest-latency way to pay rent was to walk to his bank and deposit a check into his account. Kind of weird. Sometimes I have weird professional things I pay for that need checks (tax attorney, and some real estate stuff). Fortunately, my credit union will print 3 checks if I walk by and ask nicely. And they have Saturday hours.