No. I haven’t used Windows 7, but I always switched XP/Vista to the classic theme because it takes up less space (fits a lot more minimized windows in the task bar, etc.), is less distracting, and makes it easier to judge colors in images or graphics (the big areas of blue really messes with fine color judgement). I also reverted to the “classic” start menu, switched the control panel wizard off, cut out all the auto helper doodads in MS Office, etc.
Speaking as someone who has always hated everything Windows stands for, I assure you there was no nostalgia involved