Ours is the size of a single garage because that's what it was until last year. We've got a load of Ikea open shelves and pull-out baskets - the baskets contain mostly shopping bags, umbrellas etc, and the best use for the shelves is that the highest ones have the cat carriers on. Space underneath where the toolbox lives. Plumbed-in condenser dryer stacked on top of the washing machine, with a stacking kit that includes a pull-out shelf for folding. Sink and drainer over two deep drawers, fold-down wall-mounted drying rack over the sink. Three full height kitchen cupboards (one narrow and shallow to fit the space). Games, swimming kit, a clothes rail for out of season coats, boot storage. Handy space between cupboard and wall that just happens to fit the two freestanding drying racks. Cupboard on top of a series of drawers for screws, tape, drill bits etc. Big freezer (there's an under counter one in the kitchen) and another cupboard over. Shoe cabinet. Wall mount for ironing board, bracket for the iron, and wall mounted charger for the cordless Dyson.
Best bits are the open shelving, cos I fitted it, the stacked washer and dryer, wall mounted drier (great when we haven't got enough to justify a big drying rack, but too much for a radiator), deep drawers for washing powder (after years of having them on top of the washing machine), and the Dyson.
DH wants a TV in there, for ironing entertainment. I'm happy with the radio - DAB, between R4 and R4 Extra I can always find a nice person to talk to me while I iron.