Cher has done a lot of things. She scored her first Hot 100 chart-topper in 1965 and her last in 1999. (At 52, Cher was the oldest woman to land a #1 hit until last week, when Brenda Lee broke the record.) Cher sang backup on “Christmas (Baby, Please Come Home)” and “You’ve Lost That Lovin’ Feeling.” She helped modernize the variety show in the ’70s and defied expectations in the ’80s. She won an Oscar for Best Actress. The ubiquitous robotic Auto-Tune effect? Cher did that first. But Cher is not in the Rock And Roll Hall Of Fame, and she thinks that’s some bullshit.
Exaggerated pitch correction like that sounds very different from a vocoder (at least any vocoder I’ve ever heard). I’m sure there are ways to get close to that sound using a vocoder and other tools if you really try to replicate it, but there’s a reason pretty much everyone thought they used Auto-Tune even though vocoders had been around for a long time and they claimed to have used vocoders. And as it turns out, it was Auto-Tune.
And I’d argue the reason why she thinks she changed music forever (God I hope it’s not forever) is because of how widespread that kind of use of exaggerated pitch correction has become. Not that it in itself was a completely new and different thing that was completely unlike anything anyone had ever heard ever and music is now played backwards with no notes.