Try only a third as much as you formerly used for starters. They wash clothes more gently. Old agitator type machines stir up your clothes to get them clean. New generation agitators often offer slower speeds and redesigned agitators to improve performance. Tumble action machines gently tumble them.
Most folks immediately notice less lint in their dryers and less pilling.
Later they notice their clothes last longer. Eventually they begin to launder delicate items they once did by hand or sent out to the dry cleaners. They run more quietly than conventional machines. Forget about having to turn up the volume on the radio when you do laundry. This feature is particularly valuable if your laundry facility is in your living space rather than in the basement.