A) Diesels are much noiser when cold than when it's hot out, and they get quieter after warming up/breaking in -- I noticed when I looked at Ford's on a cold day that they seemed really noisy as well, but I haven't noticed much noise from Dad's -- admittedly, this is only based on the few times we went to dinner, etc in the summer in his truck.
B) I've always driven diesels, so the noise may not bother me -- once you switch, I don't think you ever go back, same as once you drive a heavier truck, you never start driving a half-ton again -- just much more useful, especially if you ever tow something.