Communion is really important to me. The words that were used by a vicar we had for a long time were so good - "May this bread, and this wine, be to us all that our Saviour intended it to be". How's that for a great CofE cop-out?!? But lovely too...
Also, the actual word 'communion' means 'union together with' and obviously it's linked to words like 'community'. So I see communion as a statement of togetherness, both with CHrist and with the church, that whatever our differences we have this one thing that unites us and keeps us together as a wonderful worldwide family, the faith in the death and resuurection of Jesus, and the faith that through him we can know God and be forgiven and free.
Also the other word for it is Eucharist, which is Greek and it means 'good gift' or 'good grace'. So the thinking there is that sharing bread and wine is a gift that God gives the church, to help us remember and understand all that He has done for us.
"A picture says a thousand words" or whatever the cliche is, and comminion is such a visual, sensory, active thing that I think it touches deep within us whereas the words of a sermon might go over our heads some weeks! Altho everyone's different, obviously...
(This is why I actually much prefer the CofE way, Bobsmum, because I see the getting out of my seat and going forward to receive communion as an active decision on my part, a response to God, me choosing to stand before him as a really important statement of my faith - anyway horses for courses! ).