I have a Canon PowerShot SX60 with a massive 65x zoom range (21-1365 mm equivalent). There have been some compromises (small sensor, small aperture), but the main selling point is probably that zoom anyway. I bought it mainly to take pictures of birds and other animals (that are quite a long way away), which it does very well. But I was wondering now, what else is a very long focal length useful for? What can I do with it that would be tricky/impossible with a shorter focal length? As an example of what I'm looking for, this answer explains how to get a shallow depth-of-field by zooming in, which would otherwise be tricky with a point-and-shoot:
What are the depth-of-field capabilities of point & shoot cameras?