When it came to our remodel my wife was "stove, eh whatever. Refrigerator, eh, whatever. I MUST HAVE A LAUNDRY SINK." Coming from Australia she'd never lived in a house without one before. She does hand wash a fair number of clothes as well as soaking clothes, and doesn't like rinsing any non-food related things (like mops or paintbrushes) in the kitchen sink (and the bathroom sink is really small).
We have a 24" wide Ikea sink:
Q