Obviously, the risk of Norovirus increases when numerous people touch items such as serving utensils. All it takes is one person who has not sufficiently washed/sanitized their hands, and the virus spreads quickly. Anecdotal reports are just that, anecdotal.
FWIW, I enjoy the beautiful display of a Grand Buffet, and I enjoy partaking. However, I am aware of the risk. On some occasions, on any open buffet anywhere, the virus can be contracted and spread.