That hole you've been using as a hook
Why Do Pans Have Holes in the Handle?
The hole in a pan handle looks like simple hanging storage. It can also hold a spoon or spatula while you cook, keeping the counter cleaner.
Quick answer
The official reason is hanging — you can put the pan on a hook or pot rack to save drawer space. That's real and works well. But there's a second function most people never use: rest the handle of your wooden spoon or spatula through the hole while you're cooking. The spoon sits angled over the pan with the bowl hovering above it. Nothing on the counter, no sauce dripping onto the stove, no balancing act. It works especially well with thin-handled wooden spoons.

Primary stated use
Hanging on hooks or racks
Hidden daily use
Utensil rest while cooking
Best utensil for it
Thin-handled wooden spoon
Works for all pans?
Depends on hole size and shape
Next tiny mystery
More things hiding in plain sight

You thought it was just for draining
What Is the Hole in a Spaghetti Spoon For?
Another kitchen utensil hole with a second use most people have never tried.

The thing on your foil box you never pressed
What Are the Tabs on Aluminum Foil Boxes For?
Another kitchen feature that's been there the whole time and nobody uses.

You noticed the can tab
Why Do Soda Can Tabs Have Holes?
Another everyday object with a second function hidden in plain sight.