Reserve 24 wafers. Finely crush remaining wafers; place in medium bowl.
Add butter; mix well. Press onto bottom of 13x9-inch dish. Refrigerate until ready to use.
Whisk cream cheese, sugar and 2 Tbsp. milk in medium bowl until blended. Stir in 1-1/4 cups COOL WHIP; spread over crust. Beat pudding mixes and 3-1/4 cups milk with whisk 2 min.; pour over cream cheese layer.
Let stand 5 min. or until thickened; cover with remaining COOL WHIP.
Refrigerate 4 hours. Meanwhile, melt chocolate. Arrange reserved wafers in single layer on baking sheet; drizzle with chocolate. Refrigerate until chocolate is firm.
Garnish dessert with chocolate-drizzled wafers just before serving.