It's very useful in film CGI, for example if you need a background for a flying helicopter/plane/superhero or, if it's detailed enough, need to simulate a build

It's very useful in film CGI, for example if you need a background for a flying helicopter/plane/superhero or, if it's detailed enough, need to simulate a building collapsing or even just the shadows of a flying object to then overlay on your real footage. Even if you need to manually model the block you're filming on, it's still a great starting point and can be used for anything far enough or not in focus. Outside of that, I know people also use it to plan solar panel installations (simulating shadows to optimize roof solar panel placement) and I'm planning to use it for determining how much sunlight and subsequently heat different streets get with the eventual goal of being able to route around the hottest streets when walking in the summer.