I forget who linked to this recently: a clip of Conan O'Brien talking to Louis C.K., in which LCK points out that “everything is amazing right now, and nobody's happy.” Funny and true (except that in one part he seems to be saying it's only today's younger generation who react this way, which is just silly). We live in an era of commonplace miracles, and most of the time most of us (including me) don't even notice.
LCK is mostly focused on stuff like airplanes and telephones, but there's lots of other stuff in this category too. Despite its failings, modern Western medicine can be pretty damn impressive. And then there are things like light bulbs, and indoor plumbing (and the infrastructure that supports both). Not to mention books. And there are some pretty remarkable social institutions and organizations as well.
And nature stuff, too, but I think that's a different category; worth celebrating, but not quite the same thing.
What's your favorite amazing thing that we too often take for granted?