No, you are by no means the only one who thinks the Quadrasteer YukonXLs and Suburbans are the coolest SUV ever. I've got one, and I can tell you from personal experience, it is the coolest SUV ever.
Never before or since has GM, or any other manufacturer, made a 9 passenger vehicle turn in the same radius as a two door Honda coupe. Seriously. Making U turns in this Quadrasteer makes turning in my Prius feel like steering an aircraft carrier. It makes that much of a difference.
Of all the Quadrasteers made, the Suburban and YukonXL have the shortest wheelbase, at 130", as opposed to the minimum 157" wheelbase of the extended cab short bed C3 and Denali pickups that had the four wheel steering option. A shorter wheelbase of 130" is already more manuverable than 157", so adding Quadrasteer to the 130" REALLY makes for the most nimble full size vehicle ever made, with the largest interior volume to boot.
I've owned mine for 7 years now, and don't imagine ever selling it. I recently joined this forum to help me maintain it.