Anything that takes away shitty chores. People take washing machines for granted these days, but a decent dishwasher is a godsend. Modern ones don't need anything more than a basic scrape of the dishes as "prep" and loading it before bed to then wake up to a load of sparkling clean dishes is amazing.
In a similar vein we've just got a robot vacuum cleaner that we've set to run every night. The amount of dog fur in its bin every morning is eye opening, and other than for the stairs there's almost no need to do vacuuming ourselves now.