Optical Roller Ball

I think that in past few months since I have gotten my optical mouse that has a scroll wheel I have become a bit spoiled. The reason that I say that is that every time I come to the library and use a computer on the first or forth floor and want to scroll down a page on a web site I automatically go for the scroll wheel. The mice at least on the two floors mentioned aren't optical so they tend to collect junk on the little wheels that the ball turns, which slow the response time of the mouse. I never really fully appreciated scroll wheels before I got my current mouse a few months ago. As for the optical aspect I guess that I never really thought about how convienent that aspect of a mouse was until I had the mouse for awhile.