Trying to read ClearType for any length of time beyond casual glances actually makes me dizzy and my eyes start watering because of the lack of sharp edges to focus on. Non-subpixel-AA still looks slightly blurry, but I don't get the same "WTF is happening to my eyes" feeling. I prefer non-AA as well, and in the example screenshots posted in the other comment here, it's the font to the left, describing the current settings, that I find most readable.

I wonder if part of the reason for those studies indicating that ClearType "improves reading speed" is because of that - slowing down to focus on the letters feels unpleasant, so people try to scan through the text as quickly as possible.