AP Psych isn't supposed to be a stressful AP class. If someone has issues with their GPA or the such, they could rely on courses like AP Psych to boost up their GPA. Of course, that doesn't mean that the course itself is entirely a cakewalk(well depending on your school, but over here, its kinda hard if you're a lazy person such as myself). You just need to put some commitment and care into the course if you want a surefire pass and whatnot.
Courses like AP Literature at my school is terrible only because of the ridiculous due dates and assignments and what have you. The teacher there likes to teach us as if we're literally uni kids, which is okay for the most part, but I personally think he overworks us a tad bit for our own good.
AP Government here is what you would call a "Blowoff" class. While the class itself isn't too hard nor too easy, it's the right amount and it's honestly not hard to get an A in that class, if anything.
The only difficult AP courses at my school is Japanese, AP English Literature, AP English Language, AP US History, AP World History, AP Human Geography, AP Environmental Science(As far as the AP exam is concerned. The course itself isn't that hard, and is actually quite fun), and AP Calculus. Everything is is moderately to really easy, depending on you work tactics and what have you.