1. A roomba: it is a machine that cleans the floor and automatically goes back to the charging station
2. A vacuum cleaner: A good vacuum cleaner helps in deep cleaning when you are really in the mood.
3. A dishwasher: When no maid is there for cleaning utensils, a dishwasher can be a huge effort saver
4. A high power mixer: A mixer like a 1000 W can help in a big way. It makes grinding faster.
5. A full dryer: A full dryer saves time from putting the clothes to drying, picking them back etc.
Once you own these gadgets it would be great to get automated power sockets which you can program.