Adobe Photoshop's Clone Stamp Tool

I love this feature in Photoshop. From research I found out that this tool has always been a feature in Photoshop. This tool is an amazing design. All it really does is take a selected spot of pixels and clone them to wherever you want on the grid. It makes it easy to replace different things. You could take someone and essentially erase them strait out of the photo. It is genius. It is such a simple design but nobody had thought of it before, or at least never mass produced it. Once again I could not find facts on the popularity or this particular tool. There are a lot of tutorials for it online though. Making me think that it probably is pretty popular if lots of people are wanting to learn how to use it.