Comment 4 for bug 1152390

I agree. Today infact I thought for a moment that unity was unresponsive since my currently running application went grey, and going over to the launcher gave no response leaving me thinking for a moment that I had to Ctrl+Alt+Backspace. I think the simplest way would be to use a similar hover effect as in most file managers when hovering over icons, perhaps even a quick animation to fade it in/out (should be quick to make it seem responsive).