There's the benefit of not installing games on 360. While the PC and PS3 require an installation the 360 does not, so it doesn't need quite the same amount of storage as those two. Also it's incredibly easy to stream music from your PC to your 360, same with movies and pictures. So there's no need for a large hard drive. I use less than 60GB of mine and I have 2 profiles which both have saves for over 30 games each and about 12 games "installed" to the HDD because, while it's not necessary (and in the case of Skyrim, actually bad) to install games, it sometimes helps reduce load times.
Installed games run faster, and I'm not sure if you can burn the games you DL with your Xbox onto a disk, and that was why I expressed my concern over downloading games from XBL with the hard drive sizes.
Also, I always forget that some people play almost all of their games on PC. I always just assume it's pretty much only First person games and Strategy games, because that's how I use my PC.
Eh, I know the feeling. It always feels a little odd when I see someone say 'You should just be able to tilt the control stick forward' or something along those lines regarding controls on consoles. Its just too easy to fall into familiar patterns for us humans.