Make the cookie crust
Place the finely crushed vanilla sandwich cookies in a large bowl. Pour in the melted butter and add the salt.
Stir until all of the crumbs are evenly moistened and resemble wet sand.
Transfer the mixture to a 9x13-inch baking dish and press it firmly into an even layer. The bottom of a measuring cup works well for packing the crumbs down.
Place the crust in the refrigerator while you prepare the next layer.
Prepare the cheesecake layer
Add the softened cream cheese to a large mixing bowl.
Beat for about 2 minutes, or until smooth and fluffy. Add the powdered sugar and continue mixing until well combined.
Fold in about 1½ cups of thawed whipped topping. Mix gently until the filling is light, creamy, and evenly combined.
Spread the cream cheese mixture carefully over the chilled cookie crust.
For cleaner layers, use an offset spatula or the back of a spoon and avoid pressing too firmly into the crust.
Make the cheesecake pudding layer
In a separate mixing bowl, combine the cheesecake instant pudding mixes with the cold whole milk.
Whisk until the mixture begins to thicken.
Fold in about 1 cup of whipped topping until smooth and creamy.
Don't worry if the mixture becomes fairly thick. That's exactly what you want so the dessert will hold its layers after chilling.
Add the pudding layer
Spoon the cheesecake pudding mixture over the cream cheese layer.
Spread it gently from edge to edge, trying not to disturb the layer underneath.
Add the cherries
Spoon the cherry pie filling over the pudding layer.
Gently spread the cherries across the surface without stirring them into the pudding.
Finish with whipped topping
Carefully spread additional thawed whipped topping over the cherry layer.
It's fine if a little of the cherry filling swirls into the whipped topping. Just avoid overmixing the two layers.
Chill
Cover the baking dish and refrigerate the dessert for at least 2 hours.
For the firmest, cleanest slices, I prefer letting it chill for around 4 hours or even overnight.
Garnish and serve
Just before serving, sprinkle the chopped walnuts over the top.
Slice into squares and serve cold.