For me, i'd give a super rough guess at my usage like this:
* 60% home automation (turning on and off lights when hands are full, ensuring doors are locked and garage door is closed, running "shortcuts" like "i'm leaving" which will lock up and arm the alarm in 5 minutes, etc...)
* 15% playing and controlling music/tv shows on various devices in the house (tv's with chromecasts, the home itself, etc...)
* 10% as a shopping list (it makes a damn good shopping list and it's nice as hell to be able to just yell at the thing to add "frosted mini wheats to the shopping list" the second you run out and have it synced to the whole family's phones)
* 9% as a "day planner" of sorts. Generally each morning I tell it "good morning" and it tells me the weather, things on my calendar, and starts playing some news snippets I setup.
* 5% for timers/alarms (really useful while cooking to be able to shout at it to start a timer for 15 minutes then walk away)
* 1% for the dumb trivia lookups/random information. Stuff like "how many calories in X?" or "when was the Apple II released?"