I am so glad I ran across this thread. Just yesterday a friend of my DH asked if he thought I would make a heavy quilt for him. The friend said he loves the old quilts that weigh a ton that his mother used to make, but the one he has left is wearing out and has a big hole in it. He still uses it though. He said he and his two little girls would all get in a big chair with the quilt and snuggle together and they love it.
So now he wants to ask me to make him a new really heavy quilt. I was sort of at a loss because I don't care for heavy quilts and I know modern batting is really pretty light. The thought had crossed my mind about doubling the batting, and this discussion has given me so many ideas! Thanks to everyone for the inspiration.