I still question whether any of us have the anecdotal ability to gauge crowds, especially since Disney changes staffing to meet expected demand.
45,000 people at MK vs 50,000 people at MK is statistically 10% down but I doubt many of us would notice a difference in the park, even 40,000 (a 20% decrease) would probably be hard to notice beyond a little more space in the paths.
Pictures of the fireworks crowds on Main Street may be the best way to guesstimate because that’s the one time the majority of the guests are in one place and staffing wouldn’t matter.