I'm not sure of the evolution of term Goon Stroke, if anyone knows, it would be an interesting bit of info. I know that dedicated practitioners of the Goon ( and there are probably more Gooners than J'ers) like to call it the "stern pry". In no way should this be construed as someone covering up a fault, such as saying "I just passed gas" instead of "man I just ripped out a deadly fart". Indeed, I would hazard to say that millions of miles of canoe trips have been successfully completed by dedicated Stern Pry aficionados. I was one myself for many years, and put untold thousands of miles on an assortment of canoes SP'ing my way across countless lakes and rivers.
My evolution to the J Stroke was weird and wonderful. I had been practicing lucid dreaming, the act of waking up in one's dreams, and taking control of the situation. One night, my dream had me standing in a huge field of untouched snow. I had my paddle in my hand, and was wondering how to proceed. So I dug my paddle into the snow, and using a perfect J, I propelled myself over the snow in huge jumps. Eventually, I arrived at a snow shrouded river, and my last paddle-jump landed me in an icey-dicey wreck of a canoe. Still using the J, I took off, paddling into the winter wonder land.
In real life, it was the spring, the snow had just left, and the next day I put a canoe in the water, and The J came completely natural, like I had been using it my whole life.
However, magical dreams or not, I still can't J on the right hand side. I'm a dedicated lefty, only switch sides for pries or draws. It works out well for tandem travel, as most bows people seem to prefer the right. I can't even goon it on the right anymore. This in no way reflects my political orientations, it's just a physical quirk.