Guest rr, I'd say it's rap music more than pop that overuses the lazy "-ation" rhymes.

"Dave the gnome, this from the Turtles is an excellent example:
Eleanor, gee, I think you're swell
and you realy do me well.
You're my pride and joy et cet'ra."

But you left off the most groan-worthy part: in the ending of that verse they rhymed "et cet'ra" with "better!"