That's the impression I had too, definitely more Photopass people in DCA.
There was a topic once that listed all the Photopass possibilities, but unfortunately search doesn't cooperate with me right now.

I'll see what I can remember from the top of my head.
DLR:
- Right after the entrance at the Mickey Floral
- Town Square near the "celebrate" sculpture thing
- possibly along Main Street so you can get shots with the castle in the distance
- near the castle and at the partners statue
- at the Rivers of America - this one is doing a special photo of you fighting Hook
- at the entrance of Tomorrowland (special photo of you fighting Darth Vader)
- there used to be one in Pirate's Lair near the area with the pirate booty, but I think that got abandoned when Jack Sparrow disappeared
DCA:
- at the entry and at Sunshine Plaza. The entry guys can do special enhancements too like Stitch popping out of the ground.
- the waterfall near the entrance to Bug's Land
- near the bridge with the Paradise Pier logo
- Hollywood backlot near the Hyperion theatre.
I'm afraid that's all I remember at the moment, I am sure others can add to the list.