Riggie
I trained to teach in the 1970s. We had an overview of (some) special needs and teach sex ed. We also kept eyes open for any other needs the kids might have. There was no army of teaching assistants to help us, and large classes were normal. Spending our evenings and holidays preparing work was normal as were lunchbreaks on duty, doing clubs, or cranking the banda machine to print off those worksheets!
So while I know current teachers have a lot of paperwork to do, so I don't think their workload is so different.
Sorry Riggie but I taught secondary core the 1970s and in 2010s, and the workload has changed massively. OFSTED casts a long shadow, and there are so many managers in schools trying to catch the teacher out. In the 70s a teacher could shout the door and have total autonomy, now any one of a dozen people can come into your room, and afterwards rip your lesson apart. Teaching was hard work in the 1970s, but in 2010s it just relentlessly dragged you down. Class sizes in core Y7-13, much the same, except maybe bigger now in A level.
I also worked in a London special school when I was young, and it was tough. An excellent former colleague works in a local one now, and the stories of her daily work are horrific. (Most of the special schools I knew were sold off, and those pupils placed in mainstream.)