I understand that you've done the dungeon/trial a gazillion times, I really do. I find it as mind numbingly boring as you do and I also just want it over with. However, please at least greet the people you're playing with, with a simple "hi". If you do it as you load, you won't waste the two seconds it would take you to type it after the duty has started. And also, while you're at it, a simple "bye" as you leave would be cool too. You don't have to talk at all during the entire time we're in there (god forbid!), but at least do these two things.
This is one of my major gripes withe the community as it is now. I can't find any reason whatsoever not to show people this bare minimum of courtesy. It's nice to know that you're not just playing with mindless robots.