John - I think our friend MusingMuso means that practically all Dutch organs are at the west end.
I am a fan of west end organs as much as anyone, but it does depend on the size of the building. Surely this is why so many French churches have orgues de choeur. The Brussels consultant (Jean Ferrard, to put a name to him) maintains that in a large church the sound, or maybe the clarity, of the west end organ disappears long before it reaches, say, the crossing because it has nothing to "bounce off". I have seen comment that this is a problem at Antwerp cathedral although I have to say I enjoyed hearing it on my two visits there. M. Ferrard says that in Brussels the organ can be heard throughout the nave but also the sound can bounce off the opposite wall and thus travel throughout the building. No doubt an acoustic engineer can comment on this aspect further.