My primary uses: play music (connected to Spotify), set timers and alarms (one Dot is in the kitchen), and turning lights on and off (we have Hue smart bulbs). I certainly could do all those things without it, but it is nice and does feel Jetsons-esque to be able to say and have it done, especially the lights -- no more awkwardly reaching over a couch.

I've also recently created a few routines which are fun -- "Good morning" triggers a good morning response, lights on, the weather and news, and some light music. It really does feel like the future scifi promised us...