@meena That's simple: "I saved 100 watts per hour by replacing this light bulb with an LED lamp, I can leave my computer running for 2 hours more a day." And we got smartphones, giant TVs, simply more lights, …
As with cars, the sheer amount of stuff that uses the energy increased similar or even more than the efficiency won.
Just two pieces in the washing machine? Since it's costing only 2 Euro to run it, you are more likely to run it, compared to 10 years ago where it might cost 10.