So WordPress 3.5 is vastly improving the media uploader is handled. The only catch is for galleries the good ol' gallery shortcode is being used. The gallery shortcode in general works well, however as soon as you want to pick and choose specific images you get stuck passing in ids="12,322,22,5,3" - which is fine, if you have a gallery of less than 14. My idea is to have a gallery post_type under media that can be used. Then the gallery shortcode could be
[gallery slug="new-iphone-pix"]. It would be easy to reuse that gallery and simply edit the gallery once and it would be applied to all posts that used the specific gallery. Also it would easily allow for a gallery archive page.