It's funny...I thought I was so original back in high school when I first started playing with 1/4" tape loops...Of course one of my first experiments was vocal loops. Then I read about how 10CC did "I'm Not In Love" and was just like...welp. That was ahead of its time!
I can pretty much achieve that effect with my "Moot-o-tron" vocal samples using a volume pedal and tons of reverb and delay. It's a really versatile pad-esque sound...I encourage everyone with knowledge of samplers to make a vocal pad like that.
Note: it also works great on a Casio SK-1.