The default behavior is annoying to me and other users. The Enter key is used to confirm crop and transforms as well as other things. But it is also used to toggle selection of the fields in the Control Panel.
This means if you hit Enter one too many times while confirming a transformation, you wind up with your keyboard focus inside the Control Panel where it is utterly useless for doing anything else. This is just too many functions tied to one key.
This is a professional application, not an iPod. There's 86 keys on a standard keyboard. There's no need at all for the Enter key to be doing so many things. However I understand people may like the current behavior and have gotten used to it. Therefore the Enter key should be an assignable key, and toggling focus between the Control Panel and the work area should be an assignable action.
This would probably represent the best QOL change Adobe could do for Photoshop.