I pay online. It's just sooo much easier and faster. It's free through my credit union, I can easily see my previous payments. The credit union also allows us to download a list of transactions into the bookkeeping software of our choice, so I no longer haul around a transaction register. Takes me about 42 seconds to balance the "checkbook" every month, and I can see with the click of a mouse how much we've spent on gas, groceries, or medical expenses, etc.
I really don't see that keeping the post office up and running is my responsibility, just as it wasn't my grandparents' responsibility to keep wagon wheel manufacturers and buggy whip factories in business. How come no one is complaining about Kodak? Times change, technologies advance. If I need to ship a package, UPS and FedEx seem competent.