I don't think there's anything wrong with you. It sounds like your NM lacks judgment (assigning new ICU nurses to charge and precept new orientees) and is unrealistic in not listening to honest feedback from the staff regarding the most efficient way to do report.
Change certainly is difficult and often necessary but it seems like your NM is being capricious by making the change in the way your unit gives report. "Don't go into it with a defeated attitude."
Sometimes a defeated attitude is because someone is afraid of change---any change. Sometimes it's because someone just has a rotten outlook on everything. And sometimes it's someone's gut saying, "Hey, this isn't gonna work!"
You're a responsible and sensible person, TLS. IMHO, I think your reticence for this change is your critical thinking jumping in and saying, realistically, that this is not a good thing. I also think your resentment toward your NM about the new ICU nurses being charge and acting as preceptors is telling you something is WRONG with your unit.
I sincerely hope you get out of there ASAP with your dignity and sanity intact. BTW, hope you're feeling well!