I had a question- Do you think that James (and the other Marauders) would have said Voldemort's name? I would think so because James is so arrogant and thinks he's so great that I could see his using it.
Also because he does join the Order and Dumbledore encouraged everyone (at least in the second war) to call Voldemort by his name. The only reason I have to support him not using it was because it appears that people were more afraid in the first war. That this was completly new, nothing like this had happened since Grindelwald. In the second war, they have the knowledge that someone (Harry) has already "beaten" him, which may have made them feel a teensy bit better.
What do you think?