I'm really happy with the automated hallway and bathroom lights I set up with some Tuya ZY-M100s + smart dimmer switches so I can make the brightness vary with time of day. The lights automatically come on and ~95% of the time at just the right brightness too. Feels like magic.
Also tying our main kitchen lights and accent lights (under cabinet LEDs + salt lamp) into the same switch has been great since it means we actually use our accent lighting (otherwise we often wouldn't bother).
There's a thread full of people's favourite automations here: https://discuss.tchncs.de/post/467348