A good example of it would be her feature in IAM's "Bienvenue".

Starting from 1:57 to 2:19, take note on how she sings the words "world", "believe" and "belong". So annoying!

In the beginning of the song, you would also hear her "ooh-ho" repeatedly in the background while the French guy is rapping.

Not really, and I don't think that's it's that she stopped using it, it's just that her voice is more mature and textured now

I don't even understand what you're taking issue with...

No. it sounds iconic