I can definitely say that the only limit is your imagination when thinking about what automations you can setup for your home. Of course initially what could be limiting you is the amount/type of devices/sensors you have but with just a few you’re already on a good path.
Some of my current automations I like the most:
enable/disable cameras and security system when leaving/coming home
start air conditioning when batteries are full and PV system is returning power to the grid
switching on outdoor lighting at dusk or when coming home during the night (after lighting has been switched off)
Some ideas I will work in the future instead:
lawn watering system with soil temperature/humidity sensors
advanced security involving door/window sensors
doorbell notifications through light alerts in the studio (for when I wear noise cancelling headset)
Think about it for a minute, you'll come up with at least 3 different needs you wished to find a solution in the past. Go!