I am sure that if nature (or God/Allah, for that matter) had meant for us to go without foreskins, we would have been born without it.
It serves a purpose, it is easy to keep clean, fun to play with, and I for the life of me cannot understand why people are so obsessed with chopping it off.
Besides, circumcised people trying to convince the rest of us how wonderful it is, reminds me of vegetarians telling us how wonderful life is without meat.