Bring a large Dutch oven of salted water to a boil over high heat
After water is boiling, add the pasta and cook, stirring occasionally, until al dente according to package directions
Reserve 1 cup of pasta water and drain. Return the pot to the stovetop.
While the pasta is cooking, halve the tomatoes. Trim the zucchini and cut into bite-sized pieces.
In the same Dutch oven, melt the butter over medium-high. Add the tomatoes and zucchini and season with salt and pepper. Cook, stirring, until the zucchini is tender, about 3 minutes
To the Dutch oven, add the corn, garlic, lemon zest, and lemon juice. Cook until garlic is fragrant, 1 to 2 minutes
Add the cooked pasta, ⅔ cup of the pasta water, and half of the Boursin round
Cook, stirring, until the Boursin has melted into the sauce, 1 to 2 minutes. Remove the pasta from the heat. Stir in ¾ cup of the herbs
Add more pasta water, 1 tablespoon at a time, if the sauce is too thick
Season with salt and pepper. Crumble the remaining Boursin over top of the pasta and garnish with the remaining ¼ cup of herbs