In a small bowl, mash garlic and salt, forming a paste. Whisk in the lemon juice, Miracle Whip, lemon zest, mustard and pepper. While whisking, gradually add oil in a steady stream until combined. Stir in 1/4 cup cheese. Refrigerate until serving.
In a large bowl, combine the romaine, tomatoes, carrots and cucumber. Whisk dressing; drizzle desired amount over salad and toss to coat. Sprinkle with croutons and remaining cheese. Serve with remaining dressing.