Well, I mean, it's not their fault. A lot of school curriculum is federally regulated. It's not like they really decide what to give you or not.
My mother is actually a teacher herself, and I know from her that teachers would most definitely rather not give that much homework because they have to grade it all. It's more because they either know it's needed to get information across or the federal systems demand it.
That being said, homework isn't something I would do when I'm bored. It's more the thing I'm trying to get away from than anything else.