We're more active and don't really sit around much, so the patio would not get much use in our case. If we ever settle down, I could see the convenience of having it off the living area instead of having to climb stairs to go between camper and outdoors (we live in 3-level home, so stairs are natural part of our everyday life).
Some of the campsites we visit are constrained to width and length. Factor this in to your purchase. We like some locations that limit you 30' because of natural physical obstructions and other places I have had to climb the roof and do some pruning to fit my vertical height. Locations closer civilization or near a popular venue may be too narrow to deploy your slides on the left and still drop the deck on the right. This is something we looked at with our purchases so we were not limited where we like to travel.