To me, well... it has been worthwhile because i see meaning in what i do.
In terms of workload, previously, I used to be in senior management, I was usually free to do strategic thinking and most of the daily work is handled by my teams. I only feel stressed when there is a "crisis". In schools, it is the other way round, you will find yourself busy non-stop with work with not much of Crisis situations. There is also less politics involved in schools compared to private sector . As long as you get along with colleagues and students, all should be fine.

Having said that, I know of mid-careers who think they are good to end up hating their shift to teaching. You have to remember, you are no longer the technical expert in this field when you join teaching... so remember to be humble....