
In a bowl, whisk together the milk and pudding until smooth. Then stir in the cut up bananas. Set the bowl aside.
In a large glass bowl that has been chilled for at least 1 hour, beat the cream with an electric mixer until the peaks just become stiff. Then beat in the sugar and vanilla until the peaks are formed. Do not overbeat. No one likes lumpy, butter-like whipped cream.
In a large glass trifle bowl, layer 1/2 of every ingredient: Cake cubes, pudding, whipped cream, and crushed vanilla wafers. Then do a second layer with the other half of the ingredients, making sure to garnish the top with the last of the crushed vanilla wafers. Chill for at least 4 hours before serving.