Particularly because she gets over her Squick at being a frog and embraces the utility of her condition.
"Friends On The Other Side" is Dr. Facilier's crowning moment, especially at the end when he tells Naveen to blame "my friends on the other side".
Another Crowning Moment for Facilier would be when his shadow stops Tiana from destroying the talisman (the first time she tried).
Dr. Facilier's temptation of Tiana in the climactic scene is a crowning moment for them both — for the villain, his Breaking Speech (how could it be otherwise when delivered by Keith David?); for the heroine, her Kirk Summation response as she moves to destroy his talisman.
Tiana: My daddy never did get what he wanted. But he had what he needed. He had love! He never lost sight of what was important! And neither. Will. I!
While it's definitively Nightmare Fuel, no one can debate that "The Friends On the Other Side" Reprise wasn't a CMOA. Besides seeing Dr. Facilier reach his villainous comeuppance it's so awesome to see his puppets, his Shadow Demons, and even his voodoo symbols turn against him in this final scene.