I think by it's nature, Vero Beach does not get the louder spring break crowd. The resort itself is in a quiet area surrounded by mostly homes and condos. We just got home Friday, and while there were more younger people there than usual, they seemed to be there to enjoy the beach, pool and sun. It was quiet and they were just enjoying themselves. No noise at all, and our room was toward the lobby.
The beach in the center of Vero is also surrounded by home and condos, with few motels/hotels, and generally not the type of area tha would attract spring breakers wanting to see a lot of action. Great shops and restaurants, but generally more upscale.
Outside of the resort being fuller than usual, it was great and still very laid back and relaxing.