My understanding is that annotative scaling was added so that objects can print the same size regardless of scale. It is a major improvement on the (pardon my french) old school way of doing it with multiple objects on multiple layers. If there is a change to something that needs to be seen at multiple scales, only one edit is needed. The user also has the added advantage of being able to assign a specific list of scales to an object gaining the ability to limit which scales an object prints at.
This is all so far over my head, but I am VERY Surprised that I am following what you folks are talking about! - I sounds VERY Cool, but I still don't know how to do it, YET.
I am anxious to learn it, but as I said above, I am VERY far behind in work, so I don't have the time to play with it and to learn it. From what I do understand of what you are describing, I just don't see that we would use it that often. MAYBE, once or twice a year. So, I probably wouldn't remember it well enough to be productive with it anyway.
That being said, it sounds like something that would be a blast to play with.
This has definitely been one of the more interesting topics I have read lately. THANKS
craigr