Crush crackers to fine crumbs. Mix with melted butter, sugar, and salt until it resembles wet sand.
Press firmly and evenly into pie dish. Bake at 175°C (350°F) for 8 to 10 minutes. Cool completely.
Beat room temperature cream cheese until completely smooth with no lumps.
Add condensed milk and beat on medium for 2 minutes until smooth and combined.
Add lemon juice, zest, vanilla, and salt. Mix until combined. Taste and adjust lemon to preference.
Pour filling into cooled crust. Smooth the top and tap gently to release air bubbles.
Cover with plastic wrap pressed against the surface. Refrigerate for at least 4 hours or overnight.
Beat cold cream, powdered sugar, and vanilla to firm peaks. Spread or pipe over chilled pie.
Garnish and slice with a hot clean knife between each cut. Serve immediately.