I am already aware you can turn on and off the debug SuperGlobals view in preferences. However I suggest instead of that is to break the Variables tab in two. Add a second tab called Superglobals (Keep the Variables tab for the local variables and you already have the Expression tab for the watching). This way, I can easily switch between them, without having to check the debug flag on and off in Preference hell
Attached are examples from Komodo's IDE.