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Preheat the oven to 400 degrees F.
In a small saucepan heat the milk with the thyme sprigs and 2 garlic cloves. Melt the butter in a large, deep skillet over medium-high heat. Whisk in the flour and cook for about 1 minute, stirring constantly, to keep lumps from forming. Strain the solids out of the milk and whisk it into the butter and flour mixture. Continue to whisk vigorously, and cook until the mixture is nice and smooth. Stir in the 4 cups of the cheese and continue to cook and stir to melt the cheese. Season with salt and pepper. Add the cooked macaroni and the parsley and fold that all in to coat the macaroni with the cheese mixture. Scrape into a 3-quart baking dish and sprinkle with the remaining 1 1/2 cups cheese. Bake for 30 minutes, or until hot and bubbly.
While that bakes, heat a saute pan. Add the bacon, render the fat and cook until crispy. Add onion, garlic and thyme leaves and cook for about 5 minutes to soften the onion. Season with salt and pepper.
To serve, scatter the bacon mixture over the mac and cheese. Use a big spoon to scoop out servings, making sure you get some of the smoking bacon mixture on each spoonful.