I think a lot depends on the school you work in. Some are truly horrendous to be in, with appalling behaviour.
I teach secondary and I am a Head of Science. So a big, complex job. Our school is also in a very deprived area.
It's busy but I honestly enjoy it. We have strong routines, a very visible and supportive SLT - even the head is out on duty every single break and lunch unless she is out of school or in a meeting that can't be avoided. As a staff, we all support each other which helps.
I can teach my lessons without it being a nightmare. For example, today, I did a practical involving water - totally fine. Had a lesson with lots of mini whiteboard work - totally fine. STEM club experiments with water/food colouring etc- really nice.
There are difficult points and hard days, of course there are, but it is mostly enjoyable.
If you end up in a school like my previous one where SLT are far from visible and pass everything back to staff, where you are permanently short staffed, behaviour is awful and trying to teach some lessons is like wading through treacle, it's a very different matter!