In a medium saucepan, stir together the 4 cups frozen cherries, 1/2 cup sugar, 2 tablespoons cornstarch, 1/4 cup water, and 1 tablespoon lemon juice. Bring to a boil over medium heat. Reduce heat and simmer until thickened, 5-10 minutes.
Remove from heat and stir in 1/2 teaspoon vanilla. Transfer to a bowl and refrigerate until cooled completely.
With an electric mixer, beat 1 8 oz. package cream cheese and 1/2 cup sugar in a large bowl until smooth.
In a medium bowl, beat 1 1/2 cups heavy whipping cream with an electric mixer until stiff peaks form. Gently fold the whipped cream into the cream cheese mixture.
Spread the cheesecake mixture evenly in a pie plate or shallow bowl. Spread the cherry pie filling over cheesecake layer.
Serve immediately with cookies, graham crackers, etc. Or cover and refrigerate until ready to serve.