Touchwiz is full of awesome little features on the Galaxy S6. I can't remember feeling this happy about using Touchwiz ever. One great new feature of the Galaxy S6 is one that you would normally need to grab a custom launcher to apply. With the S6 TW launcher you can now change your app grid size which will allow for more apps on the homescreen.
To Change Grid Size:
-Pinch homescreen, or long press a blank space to launch the launcher settings.
-You will see options to change the grid size
-Choose one of the three options 4x4, 4x5, or 5x5
-Once size is selected widgets will pull to a corner which brings in more space for apps!