Magnifying the icons in your Dock on mouseover can be helpful, but you might not want to have the feature on all the time. How-To Geek points out that you can set it up so you only trigger the magnification with a keystroke.
Once you get this set up, your Dock won't have any magnification at all unless you tap a keyboard shortcut when you're mousing over the Dock. This is great when you want to keep a jam-packed Dock but don't need magnification on all the time. Here's how to set it up:
- Head into System Preferences and select "Dock"
- Set your Magnification to whatever size you want
- Uncheck the box next to Magnification
Now, simply tap CTRL+Shift on your keyboard, mouse over your Dock, and you see your icons magnified. Without the shortcut, they stay the same size.
How to Temporarily Enable Dock Magnifications in OS X [How-To Geek]