As shown in the video here: You'll NEVER see perspective the same way again. - YouTube
A feature Photoshop is abolishing in future versions, it seems. IMO, it’s pretty useful. Especially for BG art and/or landscapes.
It’s a 30 min vid, but you can just watch the first min or two to get a gist of the feature suggestion.
For context on how people use it, watching the first 10 mins should be enough.