Find Edges is NOT useless
Here's a trick for those who like and/or use this kind of thing:
•Duplicate a layer (be it a flat background or otherwise) and run Find Edges on the duplicate.
•Select All and copy
•Create a new channel and paste
•Delete the duplicate layer
•Select the new channel from the Select menu
•Go back to the original image layer with the new channel (alpha) selected
•Run Gaussian Blur on the selection
I call this Gaussian Sharpen and have created an action to do this
PS: It's also good for some artistic purposes, but I leave that to you...