Is there an easier way to remove a double layer of drywall on the ceiling?
If it is nailed/ screwed only to the joists without any furring strips between the joists I would use a Sawz-all or a reciprocating saw. Cut or hammer a hole large enough to verify there are no cables or plumbing between two joist. Run the saw blade along the inside edge of the joists and remove the drywall in the largest pieces you can handle. When the only drywall left is the pieces attached to the studs you have two choices. Hammer the dry wall until it crumbles then remove the nails or screws. Or you could run the saw blade along the bottom of the joist using a demolition blade cutting the nails or screws and let the drywall fall off.