Good News, washing dishes by hand is laborious, time consuming and bad for the environment.
A kitchen faucet can run up to 2 gallons a minute where as most new dishwashers use 3.5 gallons of water or less. The heating mechanisms in new dishwashers are generally more efficient then your average home water heater so not only will dishwashers save water but will also save on electricity.
Newer dishwasher models ensure that even with less water, you’re still getting your dishes as clean as possible. Most manufactures have designed their dish racks to ensure that dishes and utensils receive as much water contact as possible during the cycle.
The water temperature in a dishwasher is much higher then the hot water running out of a tap therefore a dishwasher will disinfect your kitchenware’s much more effectively then you could by hand washing.