Yes there are two Disney mini golf courses (well..technically four). There is Winter Summerland, near Blizzard Beach (the one you saw). This has two different courses. One is "winter" themed christmas while the other is "summer" (sand, plam trees, etc...)themed christmas. Both courses are 18 holes and feature various Santa and other Holiday related props. For some reason it's hard to explain...lol. I believe it costs about $16.00 per adult to play (about $10 per child, I think, but I'm not sure on the costs) and you can play the second course for half price.
The other course is "Fantasia Gardens" which is an 18 whole themed course which features different scenes from the movie "Fantasia". This location also features "Fantasia Fairways" a 18 hole un-themed course with sand traps, (I've never played it, but have been told it's similar to a normal golf course-just shrunk down-but much more difficult than the other mini golf courses)
Fantasia Gardens is located near the Boardwalk Resort (In the MGM Area)
Parking at both locations is free.
I love going to both, especially for photo ops! So make sure to bring you camera and lots of film (more than you think you'll need-especially if you have kids!)
You can find more information & pictures and updated prices at "allearsnet" just look in the "beyond the parks" section
Hope this helps!