We were there two weeks ago and saw Snow White, Cinderella and Sleeping Beauty in Toon Town at Exposition Hall without a huge line. We waited about 15 minutes. In June, I would plan on being there when Toontown opens so you can avoid long lines. I did notice that one time only Sleeping Beauty and Snow White were there so you might have to go back to get Cinderella. We went once on a rainy day and there was no line at all.
We also saw Snow White in Germany at Epcot around dinnertime, just walking around the sidewalk. No line - got a photo right away.
I had a PS at 1900 Park Fair for dinner with Cinderella, but cancelled after DD did not enjoy meeting the princesses on the first visit to Toontown. Later in the week she warmed up to characters and luckily we got back to Toontown for photos. We did just fine without a character meal, although I do hope to do CRT next Fall just for the experience.