I love the zoom from overlay (mousewheel on app window) and often use this to check apps running on other workspaces. The "problem" here is the transition that is displayed when clicking a zoomed app:

- zoomed "picture" of the app disappears
- normal transition to workspace is displayed

Try this with a some app running fullscreen. You get the impression that the view is zooming out and in again for no good reason. It would be nice if already zoomed windows could be taken into account when displaying the transition to the workspace to avoid those "flashes". In the case of a zoomed fullscreen app that would mean displaying no transition at all.