I grew up in an independent house with 2 bathrooms, one bathroom in my parent's bedroom and the other downstairs and i used to hate to go downstairs for a loo during the midnite and my parents used to get cranky at me if i knock the door during midnite. It was so embarassing. Now, i moved out of my parents, my gf & me share the same bathroom since we have only 1 so, when i am in shower, she finishes rest of other stuff :)..some how, we are managing but when i think of having kids and as the family grows, its pretty much difficult to manage with 1. Hopefully, we can afford a big house with 3 or 4 bathrooms & bedrooms :).
Good luck to you :)
Brian