May seem trivial but partly what sold Linux to me was the fact that if coping files, if there was filea.txt and filea.txt, rather than just having an option (as you got with DOS) to ignore or overwrite, Linux (well bash) gave me the option to rename.
And who remembers manually configuring the XFree86Config file.
@zleap i remember (and i even miss it every once in a while when i get into a fight with my work computer that runs modern Linux)