And in a way, we're actually working more. Back in the 70s, a single income was enough to maintain a family with a house and kids and everything. These days, it's common for both parents to work, and yet we're not all twice as rich. Most of that extra money is eaten up by higher housing costs, which often depend on what people can afford to pay for the house they need, and with double income, we can afford to pay twice as much, so housing prices have gone through the roof.
I suspect we shouldn't have gone from one parent working fulltime to two parents working fulltime, but to two parents working part time. I've got a feeling we may have accidentally ruined this for ourselves.