I sometimes get annoyed at how loud some mice scroll wheels are. I also used to get annoyed when I would accidentally double click the scroll wheel because suddenly my screen would start moving up and down erratically when I moved the mouse. Much like Luke Skywalker, I have since learned to control the double click and harness the power that it yields (sorry for all the Star Wars references, I just can't help myself).
So let's lay it all out here, double clicking on the wheel changes your cursor to the image on the left. If you move your mouse up, all the arrows except the up arrow disappear. If you move down, all but the down arrow disappear, same with left and right; basically one arrow appears for which ever direction you move. The further you move the mouse from the place where you double clicked the wheel, the faster your screen scrolls in that direction. This makes for quick work when scrolling online through a large article, or working with a long spreadsheet.
One last thing, the location on your screen where you double click the wheel affects how fast you can scroll. This means that if you want to scroll down, clicking at the top of the screen allows you to move further from the point of the initial click, thus making you move faster. In the same situation, clicking at the bottom of the screen only gives you a little space to move, thus making you will move slower. When you want to exit out of this mode, simply double click the wheel again, or left click on the mouse.