Big difference between primary and secondary, although secondary MATs are slowly catching up to the primary school trend.
The expectations for perfect displays and classroom appearance in general is much higher in primary schools - and teachers tend to have their own, defined rooms, which means that there is a much larger emphasis on what the classroom should be like, which is generally unlikely to happen in secondary schools, where teachers are often nomads.
I still have work to do over summer, but my work is different to that of a primary school teacher. While I have no preparation to do for the next year (I neither have my timetable or class lists yet, nor do I even know which room(s) I'll be in), but I do have our new Y12 students, who have work assigned in my subject over summer and will pop on with the odd question on Teams or via email.
I also had a shedload of work, which needed to have been done in my gained time last year - only most of that gained time has been taken up by other things, so I now play catch up.
My kids are still not in childcare. I generally work the odd hour during the day while they are busy, first thing in the morning or last thing in the evening while they are asleep.