Okay. Not sure if any of these options will work for you, but its something to try. Right click on your desktop and click on personalize. At the bottom under the themes, there are four options with icons beside them in the Personalization screen. Desktop Background, Window Color, Sounds, Screen Saver. Click on Window Color. It will give you a menu which, amongst other things, lets you change icon and font sizes.
Now, I want to be extemely clear. You can do lightly horrible things to your user interface with this menu. Won't mess anything up, but you move the wrong font size or icon width, and you'll be regretting it. On the other hand, to accomplish what you want, its probably your best bet.
Or you can try auto-hide, yeah. But where's the fun in that?