If deep sea divers need to come back to the surface slowly so their bodies can reacclimate to standard pressure, do astronauts undergo a similar reacclimation process as it pertains to gravity?
The issue with divers is that the extra pressure forces nitrogen bubbles deep into their tissues. If they then come up to surface pressure too quickly, the nitrogen bubbles will essentially "explode" out of their tissues and damage them.
I can see how it has nothing to do with nitrogen bubbles exploding. But why are you so quick to dismiss the concept? If gravity affects how liquids flow, bone density, and various aspects of human physiology, it stands to reason that a sudden return to earth's gravity could cause internal issues. No?
So no, this is an entirely different problem.