It's a lot of tiny things, for example having all my info in one place when I go traveling, and being able to say "how do I get to the Airbnb from the airport". Yesterday I had the agent search for events in my city every week, find the ones I like and put them in a newsletter that it emails to me. I also had it look at my book history and ratings and recommend new books. Tracks my gym sessions, what restaurants I like and what I want to get next time, etc.
Nothing you can't live without, but it reduces the thousand little paper cuts of daily life by a lot.