"Eliminating clutter can be good. I hate to have to fish through everything for five minutes to find one item that I need along the trail."
Exactly. My pet peeve, and having your tent look like a bomb went off. I guess it's about safety/security, comfort and efficacy. 8-12 lbs seems to be oft mentioned.
I'm with you Bob on the water. For me, probably because of my relative inexperience, I'm paranoid about not being able to find water. I've tended to carry more than I needed. I always factor that in when calculating my overall weight. I chalk it up as a security thing for me.
I've also found for overseas backpacking travel, if you're using public transit, it's a good idea to have a clean set of clothes or at least pants and socks (similar idea to sleeping clothes). To do otherwise would be impolite. Worth the weight.
And I save a lot of weight by dehydrating my food (lots of protein). Oatmeal, trail mix and snack bars weigh a ton relative to the nutrition you get out of it.
I've got the perfect striped shirt to go with a beret.