even get that feeling? persoanlly, I'm not sure why 'classes' are even required of 'Zendo'. why do you need formal training of something which occurs naturally?

Because you learn so many bad habits over the years that you make it so much harder for yourself. Its kind of the same way that tai chi shows you how to move naturally and efficiently. The way most non MAists move is inefficient and puts excess stress on the body.
A tai chi class will show them an easier way to use their body, a zen class will do the same for the mind.
Sticks n stones'll break my bones, but if I land the first one, you're in trouble!