I would go one further and admit to installing LibreOffice *alongside* a full MS Office installation at work. The ribbon interface in recent Office version just drives me completely nuts, and the versions of Office that do not have it yet are getting so outdated that they have serious problems opening files from the newer versions (even with the converters installed). Whereas LibreOffice generally doesn't. The formatting may be slightly off, but at least I can get to the content.
The company I work for has a full MS subscription so it's not about saving money. It's just that in recent version Microsoft made the interface so atrocious to use, while continuing to ignore long-standing, over a decade old formatting/style and image movement bugs that you run into with even the most trivial of documents (say, a few page design doc with some screenshots), and which type of problem I remember noticing since Office 97, that even LibreOffice is starting to look attractive by comparison. And yes, I fully agree that is saying something.
Yes, I seriously tried using the ribbons for a while, I just *cannot* bear it. Too bad they had to force this on all Office users, since it's holding me back from using quite a lot of nice new features (major improvements in Powerpoint, say) in recent versions.