The fact that everything colors the sound is the reason for, well, the entire music gear industry.
As for specific artists, the vast majority of John Lennon’s vocal performances were treated with ADT, or “automatic double-tracking,” a subtle effect that’s actually a major part of the “sonic identity” of his vocals.
Well, I confess myself baffled - if it wasn’t Kate Bush, I’ve no idea who it was. I couldn’t have just dreamed that one up, though - I’m not that imaginative. I yield to superior fandom and my inability to cite anything more than a vague reference to a 13 year old episode or two of The New Music.
And I certainly didn’t mean to imply any disrespect to Kate Bush, whom I think is one of the most original and talented performers of the last 30 years. The point I was trying to make was that whoever it was used this technology in a highly original manner, not that she needed pitch correction.