I am a HUGE supporter of the PhotoPass! I make it a mission to hunt those little CM photographers down every trip, lol! If you're not looking for meet and greet shots, you really have to keep your eyes open...alot of the time, you see them wander around their "spot" and if you're not paying close attention, they may just look like an ordinary guest if they aren't taking pictures of someone at the time.
Some of the "different" spots that I have gotten pics from a PP CM taken were:
At Epcot, near the Fountain of Nations there is usually a CM there and if you ask, they may know how to do the "soarin" magic shot! I love that one! We've had PP pics taken on the bridge just before France, at Japan right in front of the Torii Gate and near Norway with Tink in our hands. There are usually quite a few CM's at the entrance too, in various spots and by the base of WS.
At MK, on the bridge between the hub and Tomorrowland, with the castle in the background. Near Crystal Palace, with the castle in the background. On the bridge to the left of the castle, at the entrance to Liberty Square with the castle in the background. Outside of POTC, sometimes there is one who may know how to do a magic shot with Capt Hook. At the MNSSHP we had a CM set up in front of the POTC sign who took our pic. Of course, you have Main Street and in front of Partners too.
At DHS, we've gotten pics in front of the hat, in various spots. Alot of the photographers on Hollywood Blvd know how to do magic shots and we've had CM's take us over to benches and stand in certain spots doing stuff to get cool shots for our photopass. We've gotten pics in front of the Animation Studio and also near Star Tours holding light sabers.
At AK, of course at the entrance with the tree in the background. Alot of those CMs do some cool magic shots as well. Down further, near the tree of life sign, there is always a CM there. Near EE, there is one taking pics with the ride in the background. Also on the path between Africa and Asia, there is usually a CM positioned to take pics with the back of the tree of life in the background.
There are PP CM's in the lobby of alot of the resorts as well. We've gotten pics at WL and AKL both multiple times.
There really are a lot of PP CM's out there, you just need to keep watching! Hope this helps!