Yes, very much. I don't need a flashy UI with girly sparkles and rainbows jumping out at me. It's a computer. The interface should remain in the background relatively unseen. Plus I think the classic UI is far more "aesthetically pleasing" than all that silly glass stuff.
That being said XP was the last version Classic looked right in. The new menus and other features in Vista and 7 look like crap in classic mode because they clearly weren't designed around it. Big blank areas, misaligned buttons, etc.
Yes, for what's being touted as, "Glass" Aero isn't really all that transparent, but I still think it's more out of the way than grey borders by virtue of being translucent. .