Walls and Ceilings - Just wondering about drywall weight...

No, Im not crazy, but just wondering.....
I'm removing the old P&L walls to run some new electricity lines, new insulation and VB.
When I dumped the old P&L at the dump, the stuff weighed 310kgs (682lbs). Thats a lot of weight from just 2 walls. And they werent full walls either. Once has a fireplace on it and the other a large window.
- I was just curious to know how much does a sheet, say 4x8 of drywall weigh? and how much (if any) of weight is saved by replaceing old P&L with drywall? I would figure a fair bit. Saves some weight hanging on the walls....
Just curious.

1 sheet 4X8X5/8" is round about 80lbs. 10' 100lbs. 12' 120lbs. These are not exact weight, more like round about.

Close enough.
1/2" would obviously be less.
So, there would be a weight difference on the overall 'job'.
Less weight on the walls, comparable (or better) strength/integrity!?!?.
What do think?

Less weight is always good. Durability is not a problem, really depends on what your looking for. Is there some kind of weight restriction to the walls? are you wanting to hang cabs on it? What's the issue as far as the weight and durability. I'm just not uinderstanding the issue.

No real issue. These are just livingroom/diningroom walls. Nothing heavy duty here. I was just curious about the weight of what I dumped VS the weight of what's going on new, and the integrity of the building in general, in respect to the 'up-grade in product and process. I just figured that if there is less weight on the exterior of the house, without compromise to its structure and integrity, that this would be a good thing...in general - as you mentioned.
Home always 'settle' over time, and maybe, with less weight, they may not 'settle' as much so soon. I live on the side of a mountain and over time, the house settles. Hense, crancks in corners, - ceilings..etc..etc. The normal stuff.
I figure, if there's is less weight on the walls, etc, the house wont 'settle' as much as quickly. That's all.
When you're plying of that old P&L, your mind starts to wander..and wonder!!!

Settling usually is the cause of land movement, eroding, and water tables moving. The drywall is not the cause, or the weight of what is on your walls. In time you are going to find cracks in the walls, ceiling, but theses will be confined to the areas that have been taped, so unless they look like crators all you will have to do is fill them back in with joint compound. Good Luck.

Yep....and thanks