Yes, Disney Photographic Services did exist. They might still. My wife and I used them on our honeymoon, and on a subsequent trip in '01.
The number used to be (and keep in mind, we haven't used it since '01):
407-827-5099
It's by appointment only. I don't, honestly, remember the cost, but do know they will do photos in either a park or a resort. The more locations (as in parks or resorts) you want pictures taken in, the more it costs...that I do remember.
We got our proofs in a bound proof book, as well as a small package, as part of the cost. All of which was mailed to us (took about a week after we returned) at home, along with order forms. Not sure if they put the stuff up on the website, like with Photopass, now or not (if they even still exist...though I'm guessing they do).