Finder versus Windows Explorer

Well, I found an application/program on the Mac that seriously needs to take lessons from Windows. It is Finder. Its functionality pales in comparison to Windows Explorer (not talking about Internet Explorer but the program that starts when you click on My Computer). On Finder, the folders on the sidebar can't expand. If you want to move files from one folder to another, you always have to open another Finder window and then Finder doesn't give you the option to move or copy. It automatically moves files within the same drive and copies when dragged to mother drive. Within Windows Explorer, you can drag with the right mouse button. When you are done dragging, Windows asks if you want to copy or move.

Apple, since Windows copies everything it does from you, I think it is ok to copy the functionality of Windows Explorer from them. While you are at it, make is so you can size your windows from every side and every corner.