I'm circumsized myself. I haven't known anything different, so I don't really have an opinion. If I had a son in the future, and the choice to have the procedure done on him presented itself, it wouldn't be for religious reasons.
It
can be more hygenic. The fact of the matter is, some people don't know that you can develop
Smegma (Wikipedia English) if you aren't careful about your personal hygiene. I would use a slang term to describe this, but for those who know it, I think you know why I don't!
I've heard horror stories about men who simply have never washed that area, didn't know enough to, and have turned their partners off of oral sex completely because of
one bad experience.
I've read that it sometimes hurts to pull back the foreskin, and thus one reason guys don't wash up down there enough. I have no personal experience though.
The reason that "string of skin" described earlier in the thread drives your men nuts is simply because they aren't used to the sensation that having the foreskin provides protection from the glans and corona of the penis being rubbed (for those of you who didn't know).
So, to guys who are uncut - Pulled Back Foreskin + Washed Genitals = GOOD ACTION FROM PARTNERS