Find me a teacher that is good at his/her job, truly cares about the students, and doesn't have any of the grading assistants that used to exist that works less than 40 hours a week. I go start looking for a live unicorn that's butt fucking a dinosaur. Let's see who finds their target first.
+3 internets to anyone who makes a photo-realistic Rule 34 of my target. ;-)
As for the summers off, if you didn't hate children, I'd say try teaching for a week and see how much of your energy goes into presenting lessons and managing a classroom where 37 students can learn effectively, and see how tired you get. Don't forget to plan your lesson for the next day, either. Oh yeah, you'll also have to deal with parent emails about why their child is failing, even though he/she does no homework, but they "worked real hard last year to get an A" in a much easier class. Make sure you can handle having 5 of those 37 students with diagnosed learning disabilities, another 2 or 3 with undiagnosed issues, another 4 or 5 who are so advanced that they are bored no matter what you do (you can't switch them to a different class and have no enrichment materials for them unless you by the materials yourself), 20 or so on free or reduced lunch (if you're lucky and in a middle-class school), and an unknown number of students with drug, alcohol, and/or abuse issues. After ten months of that, just see how much you need your summer off in order to recharge and do it all again with 38 the next year (170 if you're teaching 7-12).
Quit bitching about teachers having summers off and go take your own vacation time and don't let your boss intrude upon it. Also, go thank a teacher or two (even if it was your own parents) for being able to read this and type your response. Don't forget about all of the other basics you've learned that have allowed you to have a job good enough that you can post to /. in the mornings.