They all do. There are MVS fanboys, VM fanboys, ITS fanboys (oh, yes), Windows fanboys, and so on, and so forth. It isn't the technology, it's the people.
But like a good song, if the radio stations overplay it, they can ruin the enjoyment of it for some listeners.
I think maybe we (nerds) all have the urge to be fanboys. We all have some software that we really like. Yet there are many examples of people who resist the urge to be a fanboy. Alas, the ones who give in to it are the ones who post their follies on the web and announce it to the world. The ones who don't are silent.