New to Mac / Switcher Tips: Folder Replacing in Windows vs. Mac

This is a good warning and tip from John Gruber of
Daring Fireball about "Replace" for switchers:"In the Finder, when you replace one folder with another, the old folder is deleted. On Windows, the two folders are merged. (For reasons I've never seen anyone even attempt to explain, Windows calls this action 'replacing'.)" So in Windows, dragging one folder to the same place as another folder by the same name merges the two while in OS X doing the same action actually deletes the stagnant folder and fully replaces it and its contents with the one being moved.  Gruber recommends that Apple implement a strategy where this action instead simply moves the replaced folder to the Trash rather than immediately deleting it. 

I, on the other hand, thinking that Apple will never implement this change, recommend that you learn the difference between the ways the two OSes handle folder 'replacement' and learn it fast, before it bites you in the butt.