If you don't want to cook at all you could make pesto. Just whir up a bunch of basil, a clove or two of garlic, a handful of pine nuts (or walnuts), a handful of parmesean cheese, and a glug or two of olive oil in a food processor. Season with salt and pepper and toss with pasta. Hold back a scoop of the pasta cooking water to loosen the sauce if it needs it. You can also add cream to this, which would tone down the garlic a little bit.
Chopped garlic, lemon zest, red pepper flakes, and olive oil sauteed briefly together makes another really fast sauce.
One more: carbonara. Sautee some chopped bacon til browned. In a bowl beat together an egg or two, a good amount of parmesean cheese, and lots of black pepper. Toss the cooked pasta in the egg with the bacon. The heat from the pasta will cook the egg and you'll get a creamy, smoky sauce.