I'm not a big fan of appeals to nostalgia.
If you take a long-established behavior and change it, that has very little to do with nostalgia, it has the potential to make a lot of people confused or unhappy. It wouldn't even matter much if you had definitive scientific proof that the new behavior was better... the simple act of making a change is more disruptive to most people than any benefits... and, in this case, there really wouldn't be any benefits.
My biggest dislike of that behavior (...) is that it can be confusing to novices.
I have, over the years, done quite a bit of user support, both professional and personal. In such a job, you often see
many novices, confused by
many very simple things. This is the first time I've ever heard anyone comment on this. It's so unimportant the average user never even notices it. From my observations over the years, I would even wager they don't even know it's happening... they just wave the mouse to locate the cursor on the screen and never know it was hidden.
Since you disagree, you can always go send Apple feedback on the matter:
http://www.apple.com/feedback/