One of the ways I have found Unplan to be useful is for calculating travel times between places. On a recent trip to France, I was sitting in a cafe with train tickets to Avignon, a rental car, and a home-bound ticket from Nice, a bunch of interesting places on a list, but no actual plan or itinerary.
Aside: incidently, this is why the app is named “Unplan”. While I had a few ideas on where to go, I really didn’t have a plan.