This is a few weeks old, but might be worth noting.
http://www.easywdw.com/uncategorized/magic-kingdom-cheat-sheet-day-1and-fastpass-kiosks-part-1/
FastPass+ Kiosk Locations in Order Of Least Busy to Busiest
1. Storybook Circus
Located in the back of Storybook Circus near Petes Silly Sideshow, the Circus kiosks are by far the least crowded.
Its also well stocked with cast members with iPads. Consider setting up your times here in the morning after riding Dumbo and Barnstormer.
2. Town Square Theater (with the possibility this will no longer be true if they add signage)
It may seem counter-intuitive, but the FP+ location just inside the entrance on the right is currently one of the least utilized due to a lack of signage,
Just inside, youll see this area with iPads. Like Sid Cahuengas, off-site guests cant use these iPads because theres no way to scan the tickets. If youre an on-site guest or one with a MagicBand, you can access DisneyWorld.com and your FP+ experiences through the iPad. This is the best location for doing that because off-site guests wont clog the line. This is in the middle of the day on one of the busier days of the year and there is one person here.
For off-site guests, the kiosks are located through the doors to the left of the Mickey meet.
In back on the left. Its air-conditioned, the line is orderly, and there are plenty of cast members there to help. Highly recommended under current conditions with one caveat. Dont use this location first thing in the morning because it can get swamped with people that want to immediately set up their selections. Waits will be shorter in the various Lands first thing in the morning, even at the kiosks that are not recommended like Stitch.
3. Adventureland Breezeway Near Diamond Horseshoe
Perhaps the hardest location to describe, the Breezeway is less obvious and thus, lines are shorter.
This is the walkway that connects Adventureland and Frontierland/Liberty Square near Swiss Family Robinson Treehouse.
It isnt as well-staffed as Town Square or Storybook Circus.
4. Heritage House next to Hall of Presidents
Heritage House is a newly converted (temporary) FastPass+ service center.
Its an above average location with relatively short waits, but it seems to be the most recommended, resulting in lines a bit longer than the above recommended locations. Still very good and its indoors, so its a good choice in poor weather.
5. Splash Mountain FASTPASS machines
I apparently neglected to take pictures of this location HAHA but its at the old Splash Mountain FASTPASS machines to the right of the entrance. The attraction is currently closed for refurbishment and the area may be a bit busier once it opens, but currently lines are short through at least 11am. It gets busier in the afternoon with people arriving via the train and the fact that its the only FP+ kiosk location nearby. This is the last of the recommended locations.
6. City Hall
City Hall Guest Services is busier than ever these days with the addition of FP+ kiosks. Not recommended, particularly with much easier access at Town Square Theater.
7. Adventureland Veranda
Another of the more temporary locations, cast members with iPads are stationed on the Adventureland Veranda outside Tinker Bells Nook. Lines are long and its a boring place to wait.
8. Fantasyland to the right of Mickeys PhilharMagic
This usually looks worse than it is due to the high number of cast members with iPads assisting guests. But this location gets busy earlier with its prime location and waits are long and outside in the elements. This temporary location will be replaced with a more permanent installation behind the walls to the left.
9. Stitchs Great Escape
The line for the kiosks to the left of Stitch doesnt look bad at first glance.
But it winds all the way back and around the extended queue. You do not want to be in this line.
10. Space Mountain
By far the worst is outside Space Mountain. Its hard to even see where the line starts and where it goes with so many people around. Youre probably better off just waiting in the 60-minute line for the ride.
Incoming More Permanent Installations
More permanent FastPass+ service locations are being built. One is here at the old Buzz Lightyear FASTPASS machines.
And the one next to Mickeys PhilharMagic.
And at the old Jungle Cruise FASTPASS machines.