We do this each trip we take and have six or seven pictures from different years. The line has always moved along quickly for us...we usually wait around 15-20 minutes. The line to get the photo has always been a bit longer. We never seem to time it right! We've always had two characters when we've visited. It's always been a combination of Mickey, Minnie, Goofy and Pluto.
I have noticed a decline in the quality of the photos. When we first started going the pictures were in focus and looked great. As the years have gone on the photos have gotten worse. This year the photos were completely out of focus. We are all blurry! The person helping us print the photo couldn't believe what he was seeing. Last years picture wasn't as bad. I don't know if we'll continue to do this as it's no fun having blurry pictures.