My trips were typically just overnight. When I was little, a camping trip could be from just a couple of nights to all week long and they were family affairs. The camp itself was not the center of attention, it was the river we camped beside. Even now, the camp is still not the main attraction but rather the hike itself. The purpose of camping was to allow a longer hike for the distance away from home it was, if you follow me. I didn't used to pay much attention to trying to get the load down on a backpacking trip. It was just something I didn't think about. But the decisions don't come easily, I'll quickly admit.
Some things are a given. I can't think of any arrangement more comfortable and more versatile than an ordinary sleeping bag. I mean one made of nylon, either down-filled or synthetic-something-filled. I have both. I find it hard enough to sleep when camping and since a night's sleep is presumably about eight hours, I don't want to cut corners there. Only in very hot weather will I substitute something for the sleeping bag. My tent and the accessories weights in at a little over four pounds. The tent keeps out most of the insects and keeps in some of the heat, so that's on the list for good. The biggest issue is water.
As I mentioned somewhere already, some places have plenty of water, other places maybe not that far away have none. So you either have to carry all you want in one case or come prepared to treat the water in the other case. The simple way is to boil it, since much of what you use is going to be warm anyway, especially in the winter. So you need a stove. The stove actually weighs very little but if you can get by with, say, an Esbit "cooker," the weight drops and it doesn't take up much room, either. But in the winter, it's probably worth having the stove. Here I am speaking of places where you can't have a fire. So ultimately, given what I do already, I haven't been able to really cut down pack weight very much. If I were going out more and had some extra cash, I should look for a lighter pack.
Someday, I should try for a real "Nessmuk" style lightweight tramp.