OK, I can't leave that one alone, because it gets at the core difference and the gulf that lies between cyclists and motor bike users.

Cyclists don't consider ridng hard a painful experience. Self-flaggellation is certainly not my bag. Training carefully to optimize my "engine" for difficult tasks results in joy and profound satisfaction.

I can employ the same well-tuned engine to drag a load at 20kph as I do to propell a lightly kitted bike at 35.

Admittedly, that is not so much the case for most motorized bike users. Each to their own.