Out of curiosity, are you using an external display?
Here's some advice I used years ago with this exact same problem, but with an external display that was creating some fuzziness for me - the advice here is a bit different than previous suggestions, and actually alters the level of smoothing in the OS:
http://www.macworld.com/article/1145157/smoothsnow.html
Just exercise some caution when working in Terminal.
What happened to me was this:
I was, and am, a long-time Mac user. A few years back, I needed to create a dual-platform workspace - I have my Mac on the left, and PC on the right. Up until this point, I always used Apple Displays, which had no problems with Mac Font Smoothing - but Apple displays don't play nice with, say, an HP desktop. However, HP displays will work fine with an Apple laptop. So...I now have 2 HP displays on my desk - one connected to the Apple, one connected to the HP. The HP-Apple duo, though, was displaying fuzzy - I think that HP monitor had a tough time working with the font smoothing. It looked terribly fuzzy. The solution was what I linked to above - I needed to dial down font smoothing at the OS level. No more fuzziness, no more headaches (literally).
Give it a try - let me know if it works for you.