Pash, I'm not a linguist so can't answer you on that basis. I am, however, a native English speaker (of American English). I do not believe that one form is correct while the other is not. There are several reasons to choose one over the other.
1) One of your examples is a poem or song. Use of the present participle form (ending in -ing) makes a difference in the meter, so a poet or lyricist would choose it if an additional syllable or a shift in meter is required. It could also be chosen for stylistic reasons in prose.
2) In all of the cases you've given (I believe, I may have missed one or two that are formal), the use of the "progressive stative" is colloquial rather than formal. It is perfectly correct in spoken English and in informal written English. It would probably be less correct, however, in formal writing (government documents, academic papers, letters to someone you would address formally). The example in your last post falls into this category. "You're telling me!" is a colloquial expression that was frequently used by American speakers of English (although it's beginning to sound a bit dated and it may be regional).
3) The "progressive stative" indicates something that is currently happening and will continue to happen for an indefinite period in the future. This does make it subtly different than the simple present tense of the verb which carries no indication of the action continuing into the future.
I hope this clarifies a bit. The question of "wrong" or "right" doesn't really apply, in my opinion (which is NOT that of a linguist or grammarian, but of an editor); the question of more or less correct in a given context is what's important.