Hmmm, the above post tells me what to do, I already know that, the things is that it doesn't work in a manner that helps, so say I going from Mail to a Safari, Im in Mail, I Command Tab to make Safari the highlighted application, then i release the keys. At the top of my screen I see the Safari menus, but the Mail application still occupies all/ most (not running ads in full screen) of the screen, to get the Safari window on the screen I need to go to the Safari menu, "Window" --> "my widow" and then select the window I want, at this point in time I see the Safari window on my screen and the mail one in background.
It seems to me that Application Switcher doesn't work when app are in full screen mode, which is a bummer and now its doesn't actually Switch Applications to the foreground at all, switching applications is a 4 step process, followed by a bunch of post replies, blah blah blah all with the same inefficient non intuitive results, i.e. the 4 clicks needed to achieve the outcome! Not really a shortcut