I'm using home assistant with thermostats and humidity/temperature sensors mostly to get information how the house heats and how the rooms are affected by humidity and temperature changes.
I also automated two dehumidifiers with those sensors and zigbee plugs to not run 24/7 but in defined windows when the noise isn't bothering anyone and if the humidity triggers certain thresholds. The automation also has hysteresis sesstongs so the devices do not constantly turn on and off.
In general I don't automate to a point where I can just flick a switch or turn on something manually. But it is nice to be able to control and see everything.