I guess I was one of the lucky ones also. I had an '04 F250 6.0 that I traded for an '07 F350 6.0. Had an EGR valve go bad on the first (in the shop for an hour) and a cam sensor go bad on the second (in the shop for half a day), both replaced under warranty. Other than that never a problem.
And my '12 F350 6.7 is great. So much more power than the 6.0, and I thought the 6.0 had a lot of power. Had no intention of trading the '07 but made the mistake of browsing the new truck lot while in for routine service and ended up trading.
I can squeeze over 21 mpg on the highway with the 6.7 if I am careful with my foot. But that ain't gonna happen towing. Gets a little over 10 mpg towing the Monte, but that is running 70 on the highway. Just can't seem to keep it much under that.