Favorite Photoshop Tool: Expand Selection

The Expand Selection Tool is a tool that I often use. When filling in a mask that I created with Quick Mask, I use a short cut to expand my selection (option+command+ ])  then fill it to complete the selection. I also use it to contract my selection  (option+command+ [) when I need to make my selection overall smaller. This tool can be found under Select > Modify.