Well, when you say you don't want to install a ROM, what are you saying exactly? Is it the whole concept of installing one that you don't like, or are you thinking more how Cyanogenmod is a big difference from Sense?
I can tell you that if you installed CleanRom on your device, you probably wouldn't even notice a difference from stock. Except you wouldn't have a gps icon if it's off, no CIQ, and some stock garbage is gone.
Sounds like CleanRom is exactly what you want, it's not as much a whole new world of a ROM as much as it's making stock a bit more, well, clean.