Assistant stuff. Like you bark "order a pepperoni pizza from Joe's Pizza" and it happens. You take a pic of your fridge and say "order stuff to stock it up to my usual levels". Or book a flight, or buy concert tickets or clothes, or get media recommendations, replan a trip while driving if you change your mind and add a stop somewhere. Ask to summarize group chat message floods. Put on some music. Control smart home gadgets.
It's hard to predict exactly though. I remember thinking in 2001 that nobody except the busiest businessmen would need a cell phone. A landline at home is perfectly enough and in special cases there are phone booths. And in 2011 I thought the same about smartphones. Why would I need email while walking in the street? Can't it wait until I'm home at the desktop? If I need computer stuff on the go, I can take a laptop. Similarly, I'm not quite sure how exactly it will go but probably in 10 years you'll need to have an AI agent to function in society. The legacy infrastructure decays if nobody uses it even if you'd prefer not to jump on the bandwagon. Today you often MUST have an app downloaded to do things, e.g. some museums require it, sometimes government services are much more tedious otherwise. Some restaurants only have a QR code and no physical menu. Often news items (from school, or local municipality) are only shared in social media. Etc. etc. I can easily imagine that there will be things you can't manually do in 2035, only by asking your AI agent to do it for you. And it will scan all your data to make sure that what you're doing is impeccable in intent and safety and permissibility (like an inverse captcha: you must be Gemini or another approved bot to do the action. As a human you have to jump a million hoops that maybe takes days of providing various details etc. And Gemini will be easy to spook and will be opinionated about whether you should really get to do that action or not.). And it will communicate behind your back with the AI of the other party to decide everything. Or who knows what. But it will be necessary to use.