I'd like to migrate my photo library out of Aperture, but still use it to edit photos (maybe). I'd like to export the masters and the modified versions of all my photos into standard Finder folders in the format YYYY/MM/DD. I can't seem to find any advice on how to do that.
I have been looking for a solution for you
I think its a two pronged approach - you can export the files using this guide.
Then you can use Amok Exif Sorter which is Mac compatible http://www.amok.am/en/freeware/amok_exif_sorter/