For anyone who is reading this, recently I purchased the Nikon 18-200mm - the VR II (or latest) version. I encounter some resistance with turning the the zoom ring towards the long end of the range, and less when coming back shorter. I'm sure this is by design, and probably to counter lens creep as experienced on the original 18-200.
The difference in zoom ring friction takes some getting used to, particularly when shooting action, e.g. sports, etc. But I have to say I have not encountered any zoom creep at all. Now would I expect to do so until the lens has had plenty of use and starts to show some wear. The zoom lock switch (as fitted to VR II - the lens with the gold VR lettering) seems superfluous - at the moment - like belt and braces!