I have to agree with John, and do not quite understand why some people on this board do not get the intial issue. It's really quite simple.
I have a custom piece of software I wrote that backs up my work drive to a separate machine. Its millions of files and several directories deep. Let's assume at some point I wanted to grab a file out of backup cause I accidentally saved over something that I didn't want to. If that machine was running Mavericks, I would have to do the following:
-command click to open the primary folder, and every single folder underneath it (requires two hands)
OR
-open the primary folder and click to hide the toolbar and click to open it (twice as many click operations)
So in this case, for a fresh backup, to go N directories deep to grab my file, I either need to use 2 hands or use N clicks + N double clicks (not to mention the actual movement of the arrow to the proper menu which takes longer than both the click and double click). The original functionality is N double clicks. I would assume that means the core functionality is missing (or if you want to argue semantics, highly impared that it would be considered a negatively affected feature). I work with big data where directories and files are made and removed constantly, so the idea of hiding the toolbar so that i could double click it at a later date does not apply to me a majority of the time.
As far as the argument about apple-N losing the ability to create a new folder, I agree with that completely. It was a change, in my view a negative one as I have never needed to use the new functionality. Did I personally adapt to using command-shift-N to make my folders? No, since I actually keep a terminal window open at all times and if I'm not holding my wacom pen, I find it instinctivly faster to command-tab to terminal, mkdir -p path and not touch the mouse. If I already have my wacom in my hand and already am hovering over that folder, I will do command-shift-N, but I'd say at least 10% of the time, I still accidentallly do command-N, in which I have to then do command-W and then command-shift-N (resulting in 3 commands instead of 1).