I use old clean t-shirts or hand towels to stuff my bags. I don't really like dust bags as out of sight is out of mind for me. Although on the plus side I have occasionally "re-discovered" the odd bag that I forgot about because it was in a dust bag.
I am the same as @Addicted to bags- I use old t-shirts (mostly band/concert tees for some reason) to stuff my bags. But I do use my dustbags when I'm not using the bag.
I keep my bags stuffed and in their dust bags when they're not being used nor in my regular rotation. Someday I'd like to have space to keep them out on display. I do like to admire them and think I'd be inspired to switch bags more regularly if they were visible and I didn't have to unbag them every time.
Yep, I always use them, but I might not if I had more dedicated storage space and better storage solutions.
If you have a walk-in closet, that only you use, that will obviously minimize the dust vs just leaving them lying around uncovered, for months, in shared areas of the house.