Re: Use of Japanese terminology...
Laughs - one of my students moved back to the real world and described the rei at the new dojo he joined. More formal than mine (we are pretty relaxed), more formal than Honbu and from what I hear more formal than the dojo of the Japanese teacher they claim descent from. Of course he's dead and they are sort of off to themselves but I digress.
I think rei is very important and the Japanese terminology also. In both cases you should understand the point rather than overdoing for overdoings sake.
Rei keeps us safe and Japanese terminology means that my students roughly understand what is being said when they go to Honbu.