I think it depends on when you’re traveling as to whether you should purchase the Fantasmic package. However, they’ve recently cut back on Fantasmic showings, so the package might be a good idea.
Now for restaurants… I’ve eaten at the Hollywood Brown Derby and was honestly not impressed. My dad got the Cobb Salad, which is apparently one of their infamous entrees, and it was a huge disappointment. The leaves were clumpy and it seemed old. My sister also chose a disappointing entree. My food, however, was fine (I believe I got salmon). Nothing to write home about, though.
I haven’t eaten at Hollywood and Vine since Minnie and friends were there, but the food was decent buffet food, and the characters are fun. If your DS is into Playhouse Disney, I would suggest dining here.
I haven’t eaten at Mama Melrose’s recently, so I don’t have any input. I don’t remember a thing about it.