Shift+Alt+Cmd = shortcut for Step & Repeat
After duplicating an object by holding alt (and shift, if you wanted to) in CS6, you could step & repeat the object(s) again and again by simply pressing Shift+Alt+Cmd.
Neat! No trip to the menu-bar required. No aligning required.
But that feature is lacking in the CC version. Why remove someting that really made life easy and worked!?