Slice 3 large zucchini in half lengthwise. Scoop out the center in order to create a well. Roughly chop and save all of the zucchini that you scoop out for later.
Spray or brush zucchini boats with 1 teaspoon olive oil. Sprinkle them with about a half teaspoon of the 1 tablespoon garlic herb seasoning. Heat a grill over medium high heat and set the oiled zucchini boats cut side down. grill for about 5 minutes without turning in order to seal. Alternatively, you can bake in a 450°F oven, cut side down, for 5-10 minutes. Set aside.
In a large skillet over medium high heat, melt 2 of the 4 tablespoons butter.
Add 1 pound raw shrimp to hot melted butter. Add remaining garlic herb seasonings as well as 1 tablespoon lemon juice. Allow to cook until bottom side starts to turn golden brown, about 5 minutes, turn and cook for another minute. Transfer to a bowl and set aside.
In same pan melt remaining 2 tablespoons of butter. Add remaining zucchini and ¼ cup marinated artichoke hearts. Cook until soft, about 5 minutes. Add 3 cloves garlic and sauté for another 1-2 minutes.
Place grilled zucchini boats on a baking sheet. Fill with cooked zucchini filling. Tear each shrimp into smaller pieces and place on top of zucchini filling. Top with grated ½ cup parmesan cheese.
Heat under broiler until cheese turns golden brown, about 5 minutes. Serve warm.