On my recent trips, my load has been fairly light at around 15 pounds in two rear panniers only. Average load I noticed seemed to be five packs including handle bar bag, sometimes with a pile on the rear rack, probably 40 to 50 pounds. A few heavier loads included trailers in addition to the panniers, I'd guess over 70 pounds for those rigs.
And I did meet one guy, riding across the US with family-driven van support, who didn't have a handlebar bag, lunch, or even a rain jacket.
The thing is, everyone was enjoying his or her trip. Everyone was on a different kind of trip and had packed accordingly. One guy was a photographer and blogger and had a load of computer and camera equipment, for instance.