When working on my Mac, I sometimes minimize windows to get them out of the way. I'll go work in another application, then want to command-tab back to that app. But with the window minimized, nothing much seems to happen. (The menubar change is usuallyl the only visible change.)

This video from Tekzilla shows how to switch apps and maximize a window at the same time. This is the coolest Mac keyboard shortcut I've found yet!