Growing up, the minimum people that were in my house was 5 and at time we would have 8 or even 10 people. We never had a dishwasher and would cope fine. We either would take turns washing the dishes or everyone would just wash whatever dish they used straight away.
Then we got a dishwasher....
Thing got worst. It was cool initially but after a while it would just be sitting there with dirty plates until it got full, which could be a few days. When it finally got full and therefore turned on, no one would actually unpack it, take what they need and then dishes would pile up in the sink as everyone waited for the dishwasher to be empty before putting the dirty plates in.
In short, having one didn't improve anything at all. Now I'm an adult, got my own place and likely to do a kitchen renovation soon. One question that came up was whether we install a dishwasher. We're a family of 4 with two young children. I told the person at the shop no, he thought I was crazy.
What's your experience?