Russ Moore and Robert Sager had an insightful way of talking about the significance of the Lord’s Supper that sees it (I think accurately) as more than mere symbols (avoiding the fabricated[?] Zwingli-Calvin distinction):
No doubt many Baptists have misunderstood the sign nature of the Lord’s Supper and baptism, translating the ordinances into hyper-Zwinglian terms. Baptists are reight to deny sacredotalism, but we would not speak of the baptistmal waters or the Eucharistic bread and wine as “just symbols” any more than we’ would speak of the Bible preached as “just words.” All of these are proclamations – the voice of Jesus announcing an invading Kingdom through the first stage of the invasion force, his church. Where Jesus speaks, he is there. And he is there as King and Lord (80-1).