My daughter and I did Winnie the Pooh (and Dumbo, Cindy's Carrousel, and Small World twice!!!) last April right before the fireworks and there were no crowds. The bonus to this was that we caught our ride on Dumbo just as the fireworks were going off, and yes we did see Tinkerbell fly.
So I think that the hour or so before fireworks is a great time for Fantasyland.
Winnie the Pooh is a great ride.