I make no use of it in my undergraduate or postgraduate teaching.
It's used extensively in my research, where we refer to it as the "grid" rather than a cloud. I also use cloud storage, but for reasons of data security do not use any of the commercial cloud providers (some of my colleagues use them for sharing documents, but I don't even do that).
And of course you must make damned sure that you never sync any directory containing personal information with such a service or you will have committed a major data protection breach.