Yeah, mac is a fine operating system... tbh I think its just collective hate for the sake of hate xD
...however... I like to have control over what I'm using... I dislike DRM... and in general I'm a tad bit anti-establishment. So, using a computer that takes away so much control, and tries to prevent other people from using it (monopoly) so that they can charge a bunch for their products? Not my thing. Of course I've spent many hours tinkering with my computer, with antivirus software, trying out different OSes, etc. Apple isn't totally comparable to microsoft, or linux. Apple sells the complete package, and microsoft just sells OS/software. Linux is just the OS(/kernel but whatevs).
Oh, but yeah... There really is no imagining whats going on inside a computer, because its soh gawshdang complicated. Everything is happening at the same time all the time! If you want to figure out how a computer works, read "The Elements of Computing Systems".