In Mac OS 9 if you clicked on an alias (to a folder) then pressed Command-Up it took you to the parent folder of the original item.
In OS X Command-Up takes you to the parent of the Alias
I find this quite irritating, especially as there is already Command-[ for "Back" and Command-Up is nothing to do with Back. It means "Take me to the parent of this item."
I also don't want the huge "Path" toolbar item in my Finder Windows as some kind of work-around.
Do you think this is a bug in OS X - or do you think it's intentional behaviour to make things 'easier'?