For those unfamiliar with the Silver Age of comics (or Science Fiction), a familiar trope was the 'oh no, we've swapped bodies with someone else, now I'm too disorientated to function. Think Freaky Friday but with superheroes. What makes Superman/Batman 27's story unique isn't that two male heroes, Superman and Batman, have swapped bodies with two female heroes, Power Girl and Huntress, but that the female heroes are in essence, the someday replacements for Batman and Superman. We get past the whole gender swap comedy of errors (like men trying to cope with high heels, etc.) quickly when Superman declares that he actually sees and feels his (male) body rather than the body he seems to be inhabiting. Like I said, the story isn't about what would you do if you woke up a different gender, it's about being replaced.
