Likewise. It was an intro OS-hacking platform, fine for learning about operating systems hands-on but clearly not up to par for serious use. Once learned, it inspired many students to delve into other competing - and more exotic - operating systems; having had a good look around the subject, we then found the real world was running on a small number of robust platforms, and Minix was never even close to being one of them.
Used it for an undergrad operating systems course. Never used it again.