I have used 6 dishwashers in my life and none of them did a very good job cleaning dishes. We always pre-washed the dishes to get all the particulate matter off. After it was done, we either had to had dry the dishes to put them away or leave the door ajar overnight. Dishwashing soap is pretty caustic and eventually caused the glassware to become a bit cloudy. All this is to say that, in my experience, dishwashers really aren't worth the bother and expense.
So in our latest house, we have no dishwasher. One reason is the above but also, our kitchen is downsized and I wanted the cabinet space. I'm the handler of dirty dishes and I prefer to wash by hand. Since we have a small combination kitchen and great room, this has imposed a discipline on me to take care of the dishes immediately. We don't have dirty dishes sitting around.
Interesting trivia: The dishwasher would have been cheaper than the cabinet. Our architect argued that I would regret not having the dishwasher and insisted on making a cabinet section removable so that one could be put in later.
On a related note, we also have no garbage disposal. I wanted the space under the sink for storage and I never used the old disposal anyway. What we do have is a really awesome basket strainer (Kraus) that I only have to empty once per meal.