I am quite late to this discussion but I am glad to see the issue is being discussed. Apple has always made process more easy, not more difficult. I have read through this entire thread and, despite programmer's logic, no longer providing the "Save As"function is anti-user experience. I hate all the steps I have to go through to simply save a document. With all the copies generated I have to be very cautious before I save a final doc to Word for my MS users.
This is just too complex, a challenge, and incredibly cumbersome. I am sure I am not converting anyone here but I am not yet converted that losing "Save As" is a benefit, either. I just want my experience to be easy, that's all.
Bottom-line - Losing the "Save As" function is a complex solution which, as a simple user ad not a programmer, influence me to start a document in Word instead of Pages and, thereby, losing the richness of Pages.
Oops - is that a customer not being served and breaking away???