Photoshop has far more shortcuts than I am able to remember. Doing the keyboard finger-dance isn’t my forte either, but for all that I still like shortcuts – especially the easy ones!
For me, they’re the ones that involve just the Ctrl/Cmd key (depending upon Window/Mac platform) plus just one other alphanumeric character. Of course, Ctrl/Cmd + Z is used more often on my machine than I’d like, but there are others. This shortcut is one of my favourites as it comes in handy in a couple of ways.