Roast mushrooms, elephant garlic, peppers and eggplant planks are essential at any BBQ! And I say that as a meat eater... Years ago in NYC Chinatown I went to a restaurant called "Vegetarian Paradise" with all sorts of fake meat dishes. It was fun at the time but not particularly good. One notable exception which I have had in other restaurants is mock duck breast with mushrooms layered in sheets of seitan. I've had nice versions of that but yes I'd agree on your assessment.