I have, actually. I've converted both my elderly parents and aunt and uncle, over a decade ago, to Linux. They were first running Xubuntu, and now they've been running Zorin for the past couple of years. Both of them use an pure-Intel PC/laptops (no nVidia, no proprietary drivers) and they have zero issues. All they need is a browser for Facebook/email/etc, some light document editing, and the occasional prints/scans.

Linux works 100% perfectly for their needs, since all they're doing is basic computing tasks. In fact the whole reason why I switched them over in the first place back then was because I got tired of doing tech support every time their Windows crapped out.