went for a peninsular. It gives a psychological barrier between the cooking end and the living end of the room, plumbing and wiring is easier, and you have a continuous run of worktop. You don't have to walk round and round a big island.
you can have doors (and I suppose drawers) on both sides of the peninsular units if you want. On the social side they can be quite shallow, for shelves of glasses, books, bottles etc. Nobody can reach the back of a kitchen unit anyway.