This is true. It does affect more than the font. Right now I'm looking at Safari, the menu bar and font is jagged, not clean crisp like Lucinda Grande system font was. A lot of the times, Apple Mail is particularly blurry in the font and menu bar. App Store is mostly unreadable with the tiny faded print. iTunes, the same.
I'm noticing things like in Messages when I'm responding to a message without opening the app and the font is particularly faded and jagged looking. Recently, there was a slight tick underneath one of the characters so I'm wiping the screen, but it's still there. This is absolute craziness.
Yes, restarting does fix it for a bit. Sometimes when I wake my MBP, the font appears clearer for a little while. The unfortunate thing is it does return so some who don't research this think they have eyesight problems or think their graphics card was dying out. Just great.......what a GUI mess. I had nothing like this with Mavericks. I'm so disappointed with Yosemite and the new features aren't even worth it because half the time I can't receive Airdrops to my MBP.
I tried to report this to the bug report link you provided a few times, but it doesn't accept my information. I've already done feedback to Apple many times. I'm frustrated and I so regret upgrading to Yosemite. Never again will I upgrade to a new OS X.