i have been blown off a bit by many a character signing an autograph, they see you as an adult and feel no need to give you extra attention or have an unstaged interaction.
well the second year i went i saw snow white come out in Epcot and figured i would add her to the collection, even though she is not my favorite. in spite of everyone thinking im much younger, she recognized my age at the time (mid twenties). she asked me very seriously if i had a prince, when i said no, she gave me a pep talk, including telling me that she slept in a glass coffin for a whole year waiting for her man to get her! she then had us interlace arms and said a special "wish" for me. she also made sure we posed for some great photos. my mother was a bit shocked, but it was nice to have that girl to girl talk and totally unexpected. i seriously think we spent at least 5 -10 minutes together and she was in no rush to get to the line behind me.
i think its harder to spread pixie dust to adults so its great to hear these stories.