To get started, just go to Edit> Keyboard Shortcuts. If you haven’t tried changing Photoshop’s defaults, I’d suggest you do! It’s quick, easy, reversible, and can make a big quality of life difference to your workflow, particularly if you’re used to the way another product approaches something.
That’s easy to fix and makes use of a feature I just recently talked about in my article on things Lightroom is missing: adjustable keyboard shortcuts. While you can go to File>Save A Copy, if you’re like me, your muscle defaults to the shortcut of Control+Shift+S, which in the latest version, goes to the suboptimal Save As dialog instead. Fortunately the Save a Copy interface gives you those options back.