One layer of batting in regular pieced quilts is quite enough here in FL. We typically use a top sheet and seldom add a blanket.
Pam,
I have used two layers of batting(80/20 poly) in the embroidery quilts. One layer in the block and another layer when quilted which adds extra definition. I found the meandering needs to be more open to prevent that stiff feeling. But these quilts are heavy.
The next embroidery quilt (dinosaurs for GSon) will not have batting in the blocks. It will just have the one layer of batting added when it is quilted.