Lights. In my living room I have two spotlings over book cases, a bright center light, two standing lamps and a light illuminating my electric piano. I touch one button and they all come on together. Another cycles through modes (bright, movie, reading). I have the same type of setup in the kitchen. On my upstairs landing, the light illuminates dimly of someone triggers the movement detector (so they don't get blinded at 4am). In my bathroom if I walk in at night, a single spotlight illuminates very dimly directly over the "throne", but if i tap the light switch all spotlights light up.

So in some rooms I have many separate lights operating together, and in my bathroom I have a one of 6 spotlights (which are all in the same electric circuit) operating independently.

As for "hassle", i probably spent a week setting up Home Assistant on a raspberry pi a few years ago and haven't touched it since, apart from replacing switch batteries whenever they get low.

I'm never going back.

Having said that, I'm not interested in automating anything else. Maybe home heating. I have an old 2 zone system, so adding smart thermostats to my radiators would provide completely independent control from every room in the house, whereas right now I just have a dumb-dumb "upstairs" / "downstairs" setup.