Awesome, Dropkick!
I, personally, would have zero uses for such a device, but I sure as hell would also want one!
Excuse no. 1: Everyone should have a root cellar, and think of how much easier it would be to dig one with your own backhoe.
Excuse no. 1.1: Everyone should have a storm shelter/fallout shelter/zombie protection shelter/underground hideaway/insert your own use, and think of how much easier it would be to dig one with your own backhoe.
Excuse no. 2: You can get a lawnmower deck attachment and use it as a big riding mower, making your yard work much easier.
Excuse no. 3: You could get the pallet fork attachment, put your belongings on pallets and finally organize your garage.
Excuse no. 4: Snow blower attachment for those really heavy snow loads. You could rescue your snowed in neighbors and be a hero.
Excuse no. 5: Snow blade (an attachment I'm getting) you could quickly clear the roads so your (and your neighbors) children wouldn't be trapped at home and could go to school.
Excuse no. 6: Sweeper attachment for keeping your neighborhood clean and tidy. Thereby earning everyone's respect, culminating in them presenting you with a key to the city and naming a school after you.
Excuse no. 7: Install your own underground watering system, so that the lawn you mow with the lawnmower deck attachment stays green.
Excuse no. 8: You could use the front end loader and backhoe to tear out your lawn and landscape in some drought resistant plants and rocks so you wouldn't need to water (but it would still look good).
Excuse no. 9: Build a moat around your house just because it would be cool, and you could keep healthy swimming laps (plus keeping the kids who might still be peeved over missing a snow day out of egg throwing range).
Excuse no. 10: Dig symbols into your lawn to attract the attention of aliens or deities.
Pick your own excuse - there's millions of them.