you should just be able to pick up the page, move it and drop wherever you want rather than having to resort to this.
This is easy to say, but hard to do because it creates semantic problems. If you have a book with text that flows from page to page, what should happen to the text on a moved page? Does the text "stick" with the page? If so, that would re-order the text. If not, what meaning would "moving a page" have? Similar questions arise for anchored images. And, thinking about floating images or text boxes, it gets even more difficult to decide how page re-ordering should behave.
For something like a Powerpoint presentation, where each page is a separate text flow, there is no problem with reordering pages. But, once you have text that flows across page boundaries, text boxes with their own flow, anchored images, floating images, etc, the semantics of the problem get really hairy. Basically, no matter what you do, it will always be wrong some of the time…
Given these difficulties, I wouldn't hold my breath for such a feature.