Heat oil in a large skillet over medium heat until it starts to shimmer. Add garlic, crushed red pepper and anchovies, mashing the fillets until they dissolve. Add the broccoli rabe (you may have to do this in batches, stirring each batch a little until it wilts enough to add more). Cook, stirring, until almost tender, 6 to 10 minutes. Add tomatoes and toss until they begin to soften, about 2 minutes. Add the pasta and toss to coat. If it's too dry, add a little of the reserved pasta water. Serve immediately, garnished with Parmesan if desired.