Believe it or not, not all of grading is drudgery. It can be if you have to read 20 papers summarizing the same stuff. But, reading response papers actually teaches the professor. You learn what the students actually heard, you see connections even you failed to make, and more.
We faculty groan when we grade, but mostly because we want what the students already have–an end to the semester.
Musings on Faith and Psychology 