i don't think this should turn into a 'my job's harder than yours' debate, but i have done quite a few different jobs, and by far the hardest is teaching - way harder than being home with newborn dd. of course, i've never been a brain surgeon or rocket scientist, so can't compare with those kinds of pressures.
all the things of other jobs are there, the crap managers, meetings, people who don't pull their weight. but it also has the noise levels of being in a soft play centre for a day, and kids are hugely demanding and draining on you.
i also think there's quite a high guilt factor - all those 'oh no , i should have done better' feelings kick in almost as much as being a parent makes them kick in.
and there's the fact that it's kids & noise so when you get home there's no change of pace or relief. and although the bonus of the holidays is a huge relief, i regularly used to work at least 4 weeks of the holidays (spread through the year), and it's hard to find childcare for that.
it's the problems during the year that the op is worried about - my school was really strict about this. i missed so much of dd's 'firsts' at school, even though i did take days off (on no pay) for things like her first day. you can't drop your own kid at their school on your way into work, you can't pick them up.if they're sick, you can't go home to be with them. you can never just 'have a word' with the teacher to sort out a small problem.
there are, of course, lots of jobs that make it difficult to do these things, but many offices or shops etc, will let you switch hours if your kid is ill, or make up time, or work from home for a day. schools can't do that, so teachers can't do that.
i found that the only way for me to cope was to slightly reduce my hours - just enough that i got to the school gates to pick up dd twice a week, so i didn't feel completely left out. if i'd been able to work just three days a week i think it would have been even better.
having said all that, i am now looking at job hunting from scratch (we moved to the US & I may be getting a work permit soon) and i'm beginning to think seriously about the demands of other jobs, cost of childcare here etc (there's a 12 week summer break, so childcare would be huge). i'm faced with the same dilemma, during term time an office job would be better, but during the summer & other breaks, teaching would be better.
tbh, once you've had kids, there are no such things as 'easy choices' any more, it doesn't just apply to teachers.