With respect, Steve, I think we have tried and know what the differences are.
I could not process a photograph without using the tablet (well, I could, but I wouldn't make such a good job of it).
I think it's perfectly reasonable for those of us who are advocates of using a Graphics Tablet, to say so and set out the reasons why. No-one has to agree with that view, but it still doesn't make it wrong. We each take a different approach to how we work.