We saw Cinderella, Fairy Godmother and Perla by the wishing well around 12:30 this past Thursday. Actually, Thursday we saw a bunch of princesses either by the wishing well or Carnation Gardens - Ariel, Aurora, Snow White, Cinderella, and not a princess but the Evil Queen as well (at 2 different times).
Arials Grotto Lunch is a good way to meet several Princesses without a long wait, and have lunch.
However, it is not difficult to find several Princesses on the side paths to the Castle. As Isatricia said above, you can also find additional characters with them out by the castle. The Evil Queen can be the most entertaining, and if the youngster is outgoing (Or dressed as Snow White) will give them special attentation. She usually will defend her side of the Story "Look at Snow White, she is so pail because she did not eat her fruits and vegitables. The apple was to make her healthy."
Here is what it looked like at 10:00 in the morning on the side path. A large amount of the crowd was rushing over the side path, but NOBODY was using the left side path. Belle and Aurora used the area to meet with Guests shortly after this. Snow and the Evil Queen were at the Wishing Well. I have seen guests walk within a few feet of a Prinncess and not realize she was there.
10:00 am, the Bridge is packed, the side path is empty.
Aurora all alone in the same spot.
Last Week, on the Wishing Well side Aurora stood in the shade with people walking by and not noticing her.
Look in the shade, she is standing all alone waiting for someone to notice her!
After they have been out a few minutes, lines will form because the line waiting for them is easily spotted. Look for Snow White at the wishing well from 10:00am on. Princess are out for about 20 minutes at a time. If none are out, check back in 20-30 minutes. There have been as many as 9 character out on the side paths at a time.
PS. If you are a Mary Poppins fan she hides behind the Piano at the Coke Refreshment center at 10:00am and 2:00pm most days. They are there because only a few guests notice them, so there are short lines to meet her and Bert.