Although it is difficult to find a agreement for this, I suggest
to add a menu entry "Playground" and reuse the entry "Workspace" for
the old workspace.
Soon we will have a new Pharo release. And I am afraid there will be some complaining
like this:
(Only on Workspace menu item that opens GTPlayground)
-> "Hey where is my workspace?"
But instead I would like a
Workspace menu item opens Workspace / Playground opens GTPlayground: