My IIe is somewhat yellowed and there were no smokers in my family. I've heard of using retrobright before but haven't cared enough to try it yet. If I do, I'm going to try it on an inconspicuous spot first just to play it safe.
Yeah, the CFFA is a convenience, but there's something special about the sound of an Apple IIe booting up. I was on the fence for a long time on getting one and finally decided to because eventually the floppy disks I have will fail and they are becoming harder to get, so it was a future-proofing decision. But now that you mention it, I think I'll plug my drives back in for a while for the fun of it.
Oh, and it also provides an easy way to transfer disk images to floppies too.