I can't feel the difference either. I had a lover one time who used those inspiral (sp?) condoms, and he said the sensation those produced was awesome. Again, I never noticed the difference.
I don't use ribbed condoms but I don't think they would do much for females. The insides of a vagina just aren't sensitive enough to detect those tiny little ribs.
Your vagina is obviously broken. I know mine is real sensitive. And, I like it. Josh is right....the guys usually just start jackhammering it and don't really take the time. But, (obviously) I'm not a big fan of condoms, anyway.