-Meeting Hook, Smee, Peter and Wendy is usually pretty easy by POC ride. They come out in regular intervals.
-Same with Aladdin, Jasmine, and Genie right behind Flying Carpet ride.
-If you have an Alice seeker, we found she only comes out in the mornings up until lunchtime at Teacups. Otherwise you have to do GF breakfast or tea to meet her personally.
-Judges Tent in ToonTown is good way to meet several at once, but lines can be long. If you can wait until later in the evening to do this, it usually clears out as the little ones go home (unless they have pysco disney parents like me that keep them out until park closing

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-I agree that Epcots Character place is good and not very crowded- it's right by Innovations.
-Pooh and Tigger are in the back of England in EPCOT- since they're out of sight, it's not usually too crowded. They are also in AK down a path right across from Flame Tree Barbeque (right before entering DinoLand). We'venever had a long wait here either since it's kid of hidden.
-Woody and Jesse are in the (oh man, I can't think of the name), it's the building in between Liberty Tree Tavern and the little Fronterland shops. Also never busy!
-Lilo and Stitch are always by the store to the left as you enter AK, cross the bridge, and are standing in front of the tree. Chip and Dale or Flik are usually right past that one the way to LK show.
Disney really has done a better job lately of getting the characters out more. At MGM, the characters come out every hour I think in front of the hat. They come out about the same in front of the entrance to AK and are also back by LK show in little booths. And out on Main Street entrance in MK (though that's by far one of the most crowded place to see them!)
If I think of more, I'll let you know. Have fun!