There are five people in my house. Each generates one full load of laundry every week or so. That's two sets of PJs, four pairs of pants, seven tops, seven pairs each of underwear and socks, and a bath towel.
Add in bed linens, kitchen towels, and throw rugs, and 6-7 loads a week is not excessive. I don't do laundry every day; I prefer to do a few loads at a time twice a week. But with a high-efficiency washer it's not even that much water, and they are all full loads so it's not "wasted" anyway.