Preheat the oven to 350°F and place a rack in the center. Line a large rimmed sheet pan with parchment paper.
Put 4 oz fresh arugula, 1/4 cup pine nuts, and 2 tablespoons olive oil into a blender. Blend until the mixture is finely chopped/puréed (about 20–45 seconds), stopping to scrape down the sides if needed.
Add salt and pepper to taste, then add 6 eggs and 1/3 cup grated Parmesan cheese to the blender. Blend until completely smooth, scraping down the sides once or twice.
Pour the egg-arugula mixture onto the prepared parchment-lined sheet pan. Spread it into an even, thin layer using an offset spatula or the back of a spoon.
Bake at 350°F for 15 minutes, or until the mixture is set and firm to the touch. Remove from the oven and let the baked sheet cool completely to room temperature.
Once cooled, spread all 16 oz room-temperature cream cheese evenly over the baked arugula-egg sheet, leaving about a 1/2-inch border along one short edge. Arrange all 12 oz sliced smoked salmon evenly over the cream cheese.
Starting at the short edge opposite the border, use the parchment to help roll the sheet tightly into a log. Press gently to seal the seam, then wrap the roll (parchment or plastic wrap) and refrigerate for about 60 minutes to firm.
Unwrap the chilled roll, slice with a sharp knife into rounds, and serve cold.