Layer the 20 - 30 vanilla wafers in a 9x13 pan (or glass dish). Beat 2 (8 oz. softened) packages of Philadelphia Cream Cheese with 2 cups of powdered sugar. After cream cheese and sugar are well mixed, beat in 8 ounce container of Cool Whip. Spread over top of vanilla wafers
Slice bananas and layer over top of cream cheese mixture. Drain crushed pineapples and layer them over top of bananas.
Cover with another 8 ounces of Cool Whip and enjoy. (Even better once it's in the refrigerator for a couple of hours or overnight). (You can also sprinkle crushed vanilla wafers on top for decoration).