Well. I'm not living in a big house, but believe me the simplest and less fancy automations make life way better. My favourites :

- Lights on when the first person living here arrive after sunset

- Shutdown every lights when the last person living here leave

- Main switch to shut every lights at night

- 30min light sequence from red to white every morning, everywhere, before playing the "birds" playlist on sonos : waking up like this and not having to deal with switches and darkness while my head is up my ass changed my life.

- Ungrouping every sonos devices each night a 5am and setting volume to each so I don't wake up to full volume and I can have birds in the bedroom, music everywhere else. Screw you Sonos for not making it in your app.

- Gently tone down lights when something is played after 8pm on Apple TV

- Gently lights up when something is paused or stopped on Apple TV

- Setting "night mode" on automatically on sound bar every night at 11pm

- Setting it off automatically every morning at 7am

- Using dirt cheap Ikea remotes for eveything connected, without limitation or Ikea Bridge.

Everything is possible thanks to Home Assistant and some efforts. Because manufacturers either don't care, don't want to be compatible with other brands, or want to keep new exciting features for the future.

Motion activated lights switch is also very useful for corridors and definitely not for lazy people as I often read.

For all of that, thank you HA and its beloved and passionate community !