Nobody says Metallurgist's. Everyone says iron/goldsmelter. I sometimes say Metallurgist's on streams, when I'm lacking a proper word (so I just open the building and read the name off... yes, really...), but that's an exception I guess

I'd say the Gold Smelter is a better choice.
I always thought Corn is the dumbest name in KaM, but now that Ben says it used to mean grains in general, I guess it's fine... I'd normally say "wheat" should be the name, however some people will have a problem pronouncing it correctly too, and I think they'd simply stick to Corn.
Woodcutter is an especially annoying one, when speaking about woodcutters and woodcutters' (I'm not even sure I typed it correctly here). I vote for Lumberjack - it will be much easier to use.
All the others, I don't really care. Fisherman huts are not used - or their placement isn't as important for the entire economy - as much as woodcutter huts, therefore they are not mentioned in discussions as much. Etc.