I would like to suggest that the status of this thread be changed to either under consideration or declined.
I think the one place the disposable address could probably go away is the right-click context menu on the folders. To me that context menu should be all about actions related to the existing messages in that folder - such as "mark all read", "mark all unread", "delete all", etc - or moving folders around.
Hopefully that part can be put under consideration because right now the context menu for right-clicking a folder has very little value IMO.