>9 weeks off every summer
Unpaid. Also depending on location, it's more like 5 weeks
>paid holidays
No more than required by law
>no contributions into social security
Must be dependent on location. Here in Maine, my mother contributes to social security but is not eligible for benefits from it unless she retires after 30-35 years of teaching.
>and some get classroom aids
That's a laugh, teachers don't even get sufficient budget to buy school supplies for their classroom.
>they don't design curriculum (it's purchased)
Untrue. Maybe dependent on location, but once again, here in Maine, teachers are responsible for designing, building, and running their own curriculum, on a per-subject basis.
>throw in common core for good measure
Not sure what you mean by that
The vast majority of info about teaching as a career will vastly differ based on location. For example, it is my understanding that teaching in California is closer to a $60k salary, while here in Maine, the majority of schools are more like $40k after 20 years accrued. You get about 3 personal days a year, with just a bit more sick time, meaning teachers often have to just work sick. Teachers are also required to keep their education up with taking college level classes every few years, as well as meeting other requirements (which is a good thing) often out of their own pocket (which is bad thing). You start work not after 7:45, and are "done" by 4, unless you actually do your job as a teacher and want to not be fired, in which case you are done after 7pm. You teach hundreds of students, and often end up being the sole support figure for tens of students per year, basically adopting them and trying to contribute as much as you can to their lives. Everything you do, inside and outside of work, is scrutinized by the entire town. Every little twerp of a kid is an angel to their parents, and 80% of the parents will blame you for any problem they create. Imagine the kind of hate that the lowest retail worker gets, now imagine you went to college for 6ish years and still get that hate.
The single upside (again, here in Maine) is really really good, 100% employer paid healthcare, though no dental. Pretty much the only reason my dirt poor family didn't die on the street.
If school teachers worked how much they are paid, America would have collapsed 50 years ago.