@Dad_Aint_Hip Great question!
While I have, admittedly, never used a quilt while backpacking, I have unzipped my sleeping bag and used it as a quilt enough times to know that it is a great way to go. Like you, I am less concerned about weight and more focused on sleeping comfort. I am a side-sleeper who moves around a lot at night and the constricting feeling of mummy bag can make it hard to get a good night's sleep. I've got my eyes on the REI Co-op Magma Trail Quilt 30, but there are a lot of great quilts out there.
Hope this helps!