Zigzag Cleaner Plus allows you to select actually fast and most imperceptible way to hide open windows. Just make a quick move with your mouse and program will hide applications. All or spare. To restore, just draw another stroke. Try several strokes of a mouse and see which one you like better. In addition this lets you translate onscreen mouse movements into commands to control your computer. Each symbol can be programmed to specific task.
If you need actually fast access to your desktop, this is quicker than a tray icon or hotkey-based application.