As to the original OP question:
I feel like many others on this thread, that in some ways Disney has lost their way, yet, in other areas, excelled.
The constant increases in prices top my list of grievances. The "hidden" costs that continue adding up. As a long-time AP holder I have witnessed these changes on every visit. I have also noticed that the discounts offered for rooms on property, usually include park admission (which we obviously don't need). I feel as a continued customer, my importance is minimized a bit too much. I don't expect a red carpet to be rolled out for me, there is a basic expectation of respect owed which I feel, is at times lacking.
:
Not sure what you call a hidden cost, do not remember any additional cost I was not aware of.
While some discounts require booking a package, they usually have room only discounts during the same period so you can definitely use them and as far as I know AP holders have a better discount(or I heard wrong). Anyway when I counted which offer to take, I noticed that saving from package or room only is pretty much the same, it distributed differently but you will spend same or almost same money on your trip. Personally I prefer room only, eliminates need for travel insurance, lets me pay when I am actually there and lets me go last minute, packages usually have deadlines that does not work for me.