When I had my half ton, I used to have to spread the groceries out across the backseat and truck bed. Overinflate the tires and anticipate red lights and turn offs. Usually heavy items like potatoes and milk went into the cab, and then I could stack lighter items like bread and cereal towards the tailgate.
Now that I have a 2500, I can do all of my shopping in one trip and even fill up the gas tank before going home. There is also now enough capacity for the wife, which for some may or may not be a plus.
As you can tell, my 2500HD is my daily driver. When I need to take the kids and dogs with us I use our 1 ton.