Drag and Drop file to desktop when windows are maximized
You have several possibilities:


Use the sidebar and drag &amp; drop files or folders on the 'Desktop' item
Create a 'Desktop' Dock item by dragging and dropping the folder '/Users/YourUserName/Desktop' to the Dock and afterwards drag &amp; drop files or folders you want to move on the 'Desktop' item in your Dock
Create an Automator Service to move (or copy) chosen items to the 'Desktop' folder (rough example)