Crust: Mix graham crumbs, sugar, salt, and melted butter. Press into a 9-inch springform pan. Chill 30 mins.
Filling:
Beat cream cheese until smooth. Add powdered sugar.
Whisk pudding mix with milk; fold into cream cheese.
Mash 2 bananas; gently mix into filling.
Whip 2 cups cream + vanilla to stiff peaks; fold into filling.
Assemble: Spread half the filling over crust. Add banana slices. Top with remaining filling. Chill 2 hours.
Topping: Whip 1 cup cream, powdered sugar, and vanilla. Spread over cheesecake. Garnish with banana slices and wafers. Chill 4+ hours (overnight best).
Notes
Prevent browning: Brush banana slices with lemon juice.
Substitutions: Use mascarpone for milder tang or vanilla wafers for crust.
Make-ahead: Prep crust/filling (without bananas) 2 days ahead. Add bananas before assembling.