Yes, it's nice to find fuel when you need it, and the Mass Pike is unusually well served with big "plazas" that provide a few of the essentials, and one of the stops even used to have good coffee, though Lavazza closed its coffee stand. Some of the food-court vendors are even local, and I've found Massachusetts-made candy and snack foods at some of the gas-station shops.
But farmer's markets in the parking lots trump all, and they've set up business again for the season all along the Pike, which runs clear across the state. En route to the Berkshires or Cape Cod you won't find a better place to stock your rental-house kitchen or motel room. Here's a charming item in the Globe, and here's the easy-to-navigate farmer's-market page from the Mass Ag site.