1. Checking the current temp or weather
2. Setting an alarm, timer, or reminder
3. Skipping a music track or stopping the music altogether roughly 3 seconds after hearing the command, or 1 second after you assume it didn't work
<end of list>
It is ridiculously useless for most things though. Like I’ll ask it a question on my Apple Watch and it will do a web search and give me a bunch of useless links.
for example I say: "play comically long album title by artist on Spotify", it thinks about that for five seconds, does the bing noise, then says "playing comically long album title [special remastered edition] by artist on Spotify", and then a few seconds later starts playing the album, and if you don't wait through that whole thing it will just decide that actually you didn't want to hear the album
If you tell Siri to play some obscure artist or title of which there seem to be about 10 possible hits, then sure, we need confirmation. If I tell you to play Riders on the Storm by the The Doors, just play it damn it.
Tell me my next event when I’m driving.