I'm an amateur, although I have had a keen interest for over 35 years now. When I read the 9 precepts of the UNIX philosophy (thanks for the links vermaden!) it becomes obvious why I'm interested in FreeBSD now. I've used DOS for years, and still do daily, completely eschewing the MS-Windows stuff which started to irritate me more and more as it developed. I eventually came to see that UNIX is what DOS came from. It was just a simpler version. I have never really run applications in DOS, I just have a large collection of hand picked utilities that I can string together to make it do what I want. This way of working has made me "own" the system. I can do things my way, and don't have to follow (actually fight) fashionable trends.
Of course I started using Linux when it came out, and I'm glad I did. But in the end, it also moved more and more away from what I could accept. It was just a good way to learn stuff and prepare me for the real thing. To me Linux is not better, because it is going the way of MS-Windows, requiring more and more resources and always changing for reasons that have nothing to do with computing.