I just tell people to watch what they want to watch.
I don't care about the group's "time". It's not valuable, or they wouldn't be wasting it playing a video game. The story is good, and I am not going to support ruining a new player's experience because a bunch of people who are tired of the game but addicted or forcing themselves to play want to rush.
Too bad.
Usually when the healer say "Lay off and let the guy enjoy his cut scenes... God knows SOMEONE should enjoy this run" people are usually fine with it. Afterall, people deserve to enjoy going through instances at least once before "THE GRIND".