I have a smallish home automation setup which consists of lights, Google Assistants, and some cheap Aqara water sensors all pulled together via the excellent Home Assistant project.
Last night, at around 11:30, my Google Assistant tells me there is water near my water heater. I go downstairs to discover a burst pipe in the ceiling. Shut off the water mains and am awaiting a call back from a plumber.
I can’t imagine what a mess that would have been w/o the sensors.
Best money I’ve spent in a long time.