However, I wholeheartedly agree that most of the people that blame their "harsh" ride on poly bushings are probably misplacing the blame from another component.
That's more what I meant. Poly and rubber have different applications and approaches, but I don't see poly as creating a harsh ride if the damping is done correctly.
Same goes for any change to the suspension. Anything that frees up suspension movement (reduces binding) will require additional damping.