> Dishwashers only save a little time. Most dishes still have to be rinsed in the sink first or else the leftover food plugs up the machine. And then putting away dishes takes just as much time.

If this is the case your dishwasher sucks. Other than knocking big chunks (bones, cobs, etc...) into the trash there's no need to pre-rinse dishes on a competent machine.

I do agree that dishwashers don't save as much time as you would hope, but they do help. Handwashing and drying is slow.

The laundry machine is absolutely faster than beating your clothes against the washboard, but yes, it doesn't check for stains and it is still a big time sink.

Roombas suck. No argument there. Vacuuming a room is actually pretty quick, it's picking up all of the stuff first that takes forever when you have kids.