We only have two "smart* things: when we get up to pee at night, a motion sensor turns on a light in the living room. Much dimmer than those premade motion activated lights, so we don’t wake each other. Returning to bed and triggering the sensor again turns it off.

And when it has been raining more than a certain threshold in the past 24h, the outlet into which the pump that feeds our drip irrigation is plugged turns off, and on again when it hasn’t been raining for a while. Saves lots of water, especially when we are on vacation. (The rest of that system is " dumb", though.)