Have you ever looked after 30 children all at the same time? All with different complexities and needs. Have you then tried to teach them something (in fact lots of somethings!) while suiting the needs of a child who really struggles up to the one who is massively gifted? Added into that it's teaching them things that are massively beyond their years or dry as old toast thanks to the curriculum (fronted adverbials and propositions at 8 years old!)
Added onto that the increasing likelihood that you'll have a child (or several) with significant behaviour issues, often without the support. I had my classroom trashed several times before Christmas (key stage 1). Behaviour support just say 'you're doing all the right things.' Funnily enough I'm not exactly relishing the thought of going back. I've been teaching over a decade. My kids do brilliantly. I am exhausted ALL the time. I work between 60-80 hours every week (including half terms). I get some respite in the longer holidays but I do catch up classes during them too.
The pressure to be a good (or better) school is huge despite the fact that you can be classed as requires improvement for all sorts of things that are barely in your control.We fell down on attendance for example.
We are scrutinised weekly through learning walks, lesson obs, book scrutinised, planning scrutinies, governor visits, school improvenent partner visits, sats tests for year 2 and year 6 (with times table tests becoming compulsory too), phonics tests for year 1, Ofsted, pupil interviews, parent sessions, parent questionnaires etc etc. There is literally never any space to just get on with the job - the job I am regularly deemed to be outstanding at by many different sources. Have I considered wrapping my car around a tree? Yes. Have I considered breaking my own leg to get a few weeks rest? Yes.
I have been teaching a long, long time. It's hugely stressful - pretty much every day. I'm not naturally a stressed personality type and I work in a very supportive school. If you've never worked in a school you can't begin to understand what it's like and yet everyone thinks they can because they've all been to school.
Are other jobs stressful? Of course they are. It's not a competition.