Didymos,
"The more intelligent one is, the more knowledgable one becomes, the more one increase one's sorrow." Schopenhauer
I think your right about the over use of certain terms, if one is to have expectations of great or constant happyness one is setting one's self up for disappointment. There is something to be said for ignorance and perhaps unawareness, example, if there is a condition developing in the world say the population explosion and there is nothing you can do about it, your fate tied to the folly of the population as a whole. You are better off not being stressed with concern about it, better to be unaware---the more one increases one's knowledge, the more one increases his sorrow. Why do children seem so happy, because they are blissfully unaware of the human conditon.