Tantrums - not everyone is having a hot drink - if I'm getting lunch I'll just have water. It doesn't take me long to eat a sandwich, I just would like to sit down to eat the food I have paid for whilst doing so.
Maybe this is a London thing, but certainly in many of the major museums there are several different food counters, the cafe can be very spread out so your child could potentially be out of sight whilst you, yes, spend a long time queuing. And I'll say it again - if I'm getting several different plated items they would not fit on one tray - how am I meant to carry that by myself? And if it's just me and DD, I am NOT, whatever MN thinks, going to sit her on some distant table whilst I queue up, and if I was by myself I wouldn't dream of leaving my coat or bag on a chair to save it, I might as well shout very loudly 'here's my unattended stuff, feel free to steal it'. Jesus, I can't believe this needs fucking spelling out. I understand that a lot of people in the queue might be annoying, but at least it's not stopping anyone from eating their food that they have paid for, and that the cafe owners have provided tables for.
And going somewhere else, which could easily be just as busy, is not always an option. It wasn't an option the other day when I met my sister in her lunch hour (nowhere else nearby to go), and excuse me for not realising how busy it would be.
And to all of you saying, I've NEVER EVER IN MY LIFE SEEN THIS, NO-ONE I KNOW DOES THIS - you don't know everyone. I know I'm not alone, and I know I'm not lying. And yes, it's a small point in the grander scheme of things but so what? D'you say that on all the baby name threads, or sleb twaddle, or anything else of no real importance threads that people start?