Do some of your schools really individually hand over each child to a caretaker? Doesn’t that take forever?
My dds school has a system where Reception and Yr1 come out of one entrance, Yr 2, 3 and 4 out of another entrance and 5/6 come out of a 3rd entrance. Each door leads to the playground but each year group has their own "pick up area" where the parents wait.
Year R and Yr 1 come out in a line with the teacher and TA, the teacher goes along the line and each child is asked to identify the person collecting them. If the parent isn't there then they stand to one side with the TA in case they're late. When your child is at the front of the line, most parents call their child's name, the teacher confirms that you are mum/dad/grandparent etc and you go. At the start of the year it takes longer as the staff don't yet recognise every parent/carer but by the end of the first term the teacher usually looks at the crowd while walking out, looks to see who's at the front of the line and will say "Johnny, I can see your mummy. Jane, your daddy's here for you. Michael, is that your granny waiting there? Mary, I can't see your mum yet so stand with Miss Jones till she gets here etc " and dismissal takes 2/3 mins maximum.
Yr 2,3,4 the class comes out with the teacher, they stand in their specific area of the playground and the children look for the person collecting them. When they see them they tell their teacher and go. Any child who hasn't located their parent is expected to stay in their area so the teacher can easily see who is left at the end of pick up and they can be taken back inside to contact parents (if they havent called to say they'll be late)
Years 5 and 6 are just let out into the playground but any children who are allowed to walk home are already known to the school as they ask you to fill in a form at the start of the school year to indicate whether they can walk home alone. Any child who is supposed to be collected but isn't, by Yr 5 they are expected to take themselves into the office to inform reception that they havent been collected.