What kind of automations have you found necessary? Any time I think about getting into it, I can only think of automations that sound silly or extra but nothing truly time-saving.
I got tired of tuning the speed on air purifiers at home. Since outdoor PM levels can change up to 1000× in a single day, you have to adjust accordingly, and it takes a lot of attention to do that.
So I set up automation for that based on a few parameters: indoor and outdoor particulate matter levels (current and averaged over the last hour), noxious gas levels based on third party monitoring, wind direction and speed, and the weather forecast for the next few hours.
You can set up zones based on your phone's GPS (there is a Home Assistant mobile application that can report data back to the server), or you could set up an automation based on whether your phone is connected to your home's wireless network. Or probably even via some Bluetooth beacon.
