Bring 6 cups water to a boil in a large saucepan. Add shrimp; cook 3 minutes or until done. Drain and rinse with cold water. Peel and chill shrimp.
Combine shrimp, dressing, tomato sprinkles, and rosemary in a large bowl. Add pasta and next 5 ingredients (pasta through bell peppers); toss gently to coat. Cover; chill 1 hour. Sprinkle with cheese and black pepper. Garnish with chopped parsley, if desired.