So I subscribed to the map folio earlier on when it came with maps from the campaign rather than just city maps. I assumed that this was what the folios would always be, but to my surprise when I pulled down the Carrion Crown Map Folio it was only city maps.
I can honestly say I'm very disappointed. I laminate the regular maps and use them so I wouldn't have to constantly sift through adventure path to find the map that I need. Huge city maps are not useful in a usual campaign run. They are just to big to be practical unless you have permanent wall space you can hog.
I really would like to see map folios with dungeon maps again and maybe even handouts. Yeah, the paper isn't great quality, but that is why I laminate mine. It's cheap to do and they will last forever.
For the Carrion Crown, odds are I will only end up using the map of Ustalav, and that I will pull out sparingly because of the size.
Map folios changed to the current format with the Kingmaker Adventure Path due to customer feedback. The current style has been much better received in general.
Personally, I've found the map folios for both Jade Regent and Skull & Shackles (both in the newer format) to be invaluable game aids, and am glad for the changes Paizo made.
I think the older maps were far more useful. I rather wish the map folios were now their own separate subscription. I don't use huge maps except a large map of Golarion and for the Carrion Crown I may sometimes use the map of Ustalav, but I have no place to hang it and it's likely to get damaged if I bring it out all the time. It's expensive to laminate posters like that. I find having separate good color maps of dungeons and buildings to be far more helpful party aids and useful when I need to draw out things for the players. Maybe I'll just sell my map packs or something.
I framed my map of Ustalav with a poster frame I got from Wal-Mart for $10. I've considered buying a second Carrion Crown Mapfolio so I have a spare. My main complaint with the Ustalav map is that Sen's Pass (mentioned in Rule of Fear, and where I'm running my Ustalav campaign) isn't on the map.
I much prefer the new format for the map folios to the old one.
I do understand the desire to have them not be part of the Campaign Setting subscription. People have complained about that for ages. It does make more sense than putting them in the GameMastery Maps subscription though, because the GameMastery Maps product line isn't campaign specific.