One person goes and sits down while the other orders the food etc and then brings it over to them?
I can see both sides of that one. However, one thing my Mum and I really enjoy is going out shopping together. When we stop for a break I do leave her sat at a table surrounded by bags while I go and get the necessary. This is for two reasons, firstly, we've got bags of shopping and it's maybe not the best plan for us both to be in the queue when we don't need to be carting that lot around. But the main reason is that my Mum needs to sit down quite regularly, and can be a bit unreliable carrying a tray.
So I'm on the fence with this one.