Indeed you clearly don't know what teachers really do. Having observed both my parents working as teachers when growing up you cynicism is offensive in some ways. I know a number of teachers who do all of those things during their "holidays". Like everything we do prior preparation is required by teachers and that can't be done in the classroom.
I have to agree. Great teachers do work much longer than it appears. The trouble I think, is that there is a (most likely large) proportion of people in the profession who are not great. They are the ones beating the kids out of the gate when the bell rings. And they spoil the perception of the profession as a whole. Which is why we need to eliminate those kinds of teachers and encourage those who could be great, to enter the profession. I think everyone has hopefully been inspired by a teacher and remembers them into their adult life. I have a few in mind, but I have experienced personally, and through my now adult kids, teachers who should never have been in that profession.