Yes, we did it. We flipped a switch and the power was out at our house yesterday (except the refrigerator/freezer). I have to admit that I was at work for much of the day, so I had less time to experience it than others.
I noticed several things. First, it was a lot calmer after dark with only candle light. It also smelled nice. The time we might normally have spent on the computer was spent sitting with the kids and goofing around. The kids that did the dishes by hand spent more time talking to each other in the kitchen about their day than they normally do when the dishwasher works. Most of us got to bed earlier since it was dark. I realized that I could live with much less light in the house. In fact, the next morning when the lights were turned on it seemed too bright. I personally didn't miss much of anything we had to give up for that short time. Maybe it was because I knew it would come back on. Or maybe it was because life was still fine without the extra conveniences. I had forgotten that the sink disposal wouldn't work, and the sink drained slowly. To be honest, I enjoyed it overall. The kids now realize how many different things require electricity. They also learned about cold showers. It was a great learning experience. To be something that motivates a change in the way we relate to each other in sending our time, I think we would need to do it more often. Why not?
I did wonder how much electricity the U.S. could save if every household voluntarily turn off the power for one day a week. I bet someone has calculated it and said so on the Internet. Maybe I'll use a little electricity to look. After all, isn't it Earth Day?