Personally, I find that all GUI-based systems are easy to use for beginners but difficult to use for experts. But that describes both the WIndows and Mac markets, in my opinion. At least Apple has put some power-usability into its OSes for quite some time in the form of AppleScript, or has at least tried to. Automating anything on a Windows machine is an exercise in aggravation.

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So no, there is almost no time that I've gone to a directory by mouse and would find it more convenient to press enter/return than use my left hand to press the F2 key.

Well, no, but if you're seriously going to rename a file using only your left hand, then you're probably not in much of a rush to begin with.