In my experience, it is possible to bring parts of the experience back and subject it to analytical and critical thinking, but it is very challenging. The trip does tend to defy comprehension by the normal mode of consciousness, which is why descriptions have the quality you call "vagueness". In short, distilling more than "irreducibly spiritual nonsense" from the trip takes work, not unlike the work of organizing thoughts into a term paper. It can be done, and the more analytical your habits of thought to begin with, the more success I think you could expect.