Are Long-time Olympus users like Leica Zealots?

It was the beauty of the Pen camera prototypes that caused me to look at m43 cameras in the first place. Sure, I bought the G-1 instead, and then the GH-2, and a dozen Pany lenses, but it was Olympus that got me interested in the first place. The EM5 is another piece of art, although I've yet to buy an Olympus camera, and I only bought my first Olympus lens (the 75mm) a few months ago.

Regarding the rest of your question, there are quite a few people here who seem to be brand-conscious to an extreme, but that doesn't seem to be unique to any one brand -- quite the opposite in fact!