As promised, I ran around town looking at some commercial range hoods, and took a few pics. Much to my astonishment, I encountered a few that actually appear to comply with the NEC!
This first one ... looks like I got there right after the cleaning guy ... has EMT to Appleton vapor-tights. In case you were wondering, the CFL's seem to work really well in this application:
Another restaurant also had EMT to the hood lights, with an extension to serve a stove-side receptacle:
Finally, her is a better view of the hood at that Chinese place:
Much to my surprise, the last hood looks to be in compliance. I was careful not to tell the owners that; I think they consider code compliance to be a mark of shame, and they would surely change it if they knew!