We have Google Home’s in most rooms. The system is integrated with home assistant, and is reliable enough that the WAF is high (with the 4 kids as well).
Some things we use it for:
Starting the coffee in the AM when we get get up. We know it takes 5 mins to brew, so we ask at the right time, and coffee is waiting for us when we get downstairs.
Setting alarms, so we know when to wake up. With the kids going to three schools with different schedules and flexible jobs, it’s not always a consistent time, so we ask it to wake us up the next day at the time we need for that day. Likewise, the kids schools have block day schedules, so it’s not consistent during the week.
Setting multiple timers when cooking, or working out.
Asking it to open the gates, so when we expect company, they can come in without using the keypad, doorbell.
Telling HA to turn on the BBQ Gas valve when I am heading out to grill. The grill’s gas line has a valve controlled by zigbee, so it turns off after 2 hrs of being on (normally), this way I never forget to turn the gas off on the grill, and have it be on for 24 hrs.
Playing music in the whole house music system (I use chromecast audios). Great for playing songs or playlists that are all synced with phones.
Turning on and off lights in the rooms, but also controlling thermostats - we have a heat pump system with a few zones, so this is very handy if the program isn’t automatically doing the right thing.
Asking for a weather forecast, both locally or remote location if I am packing for travel the next day. Asking about traffic on the way to work.
Opening closing the garage doors on the way home from work, or closing them if I forgot to click the button the car to close them.
Turning on the hot tub, or pool lights, etc… It’s very nice that the voice control on our phones and the voice control act exactly the same way.
There are a lot of other things I suspect as well, but that’s what comes to mind. The ability to get at calendars, map info, traffic weather etc…in the same interface both on the hubs and the phones is very very useful. At a minimum I need it to work in the car as well.