Back in the 90s when I was both BA and sq "gold" and travelled a lot, both short and long haul, a BMI cc lady told me (in 1C) in no uncertain terms to put my paper down and listen to the briefing.
On reflection, she was quite right and I have been very good at watching and listening to safety briefings ever since. I am tempted to nag others, but I guess life is too short.