The coloring of the drawer fronts is a great idea heck I may even bother to paint the faces of my drawers on a 8ft long cabinet I have had for years to add spice, color, and as my wife might comment FASHION, to the mix. (laughing)
You figured it out! The color coded drawers is a theme I started with my workbench, which I plan on showing soon, and it works great for both getting tools and for returning them.
Saves a great deal of time overall and yes it has helped many times when I needed someone to retrieve a tool.