Last summer in August we were able to ride all of the Fantasyland rides at night with little or no wait with the exception of Peter Pan's Flight, which, even at 10pm at night had over a 90 minute wait! Lines were nonexistant at Pooh, Snow White, Philharmagic, and Small World. All of those were literally walk-ons. I must admit that I didn't look at Dumbo's line as we weren't going on that one.
So, if you don't mind not riding Peter Pan, you can do them all at night with very little wait.