Elsewhere,
Sometimes there are long lines. But here's the thing, a game or a concert will last at most 4 or 5 hours. I try to plan ahead so that I only have to go once, if at all. But those conventions last all day, and there are lots and lots more children (who need to go every 2 hours or so), and more often than not, their mothers take them. Also, if you still go, check it out, there really are a lot more women at these conventions than men. For other events, particularly sporting events (which is often for what the facilities are predominantly designed), there is a different balance of the genders.
But out and about, like at restaurants, if there is a wait, it is only for the women's room. It is the worst at the symphony, or theater, where the intermission is only 15 minutes, there are only about a dozen toilets and about 25% of the women in attendance need to go.
What I remember is the awful smell at the conventions. I have been to these same venues many times for concerts or games and the restrooms never had that awful smell that was pervasive at conventions. Blech. Shoshana