I don't fly as much as most of you...I've never even heard this announcement and on most flights (which are generally international) there are lines and nobody cares

Especially after the meal service/movies end/hour before landing.
Personally, I try to book a seat a few rows from the restroom on the aisle, so I can *go* when there is no line, but obviously this isn't an option for everyone on the plane. Reality is with 300 PAX on a plane, some people will need to go at the same time whether the crew likes it or not. And airline food can be a source of all that *going*