The newer energy efficient models have longer run times. Most will also include a "1 Hour" wash cycle, as well as a "Sensor" cycle, which can sometimes dramatically shorten the run time.

Doesn't your kitchen start to smell?
 

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Yep!

Not water
 

There is no need to run the water to get hot water either, the DW heats it for you. I see the preheat on my energy usage app. Hot water is just over 1.25 cents a gallon with an electric water heater (SECO) if washing or prewashing by hand. This is your savings over hand washing.

A months use of the dishwasher costs 65 cents if you eat out fairly often. That is .45 for drying and the heater in the DW It is .25 to operate the pump and controls. The DW uses 5-6 gallons per cycle.

You should still scrape, shouldn't you?

I do, but not rinse.