If you speed up the song "Imaginary Lover" by the Atlanta Rhythm Section (a top 10 hit from 1978), it sounds exactly like Stevie Nicks.
Unlike many others on this thread, I think Stevie Nicks was a great singer. Her "Silver Springs" should have been on Rumours.
I like Nick’s voice also. For me it’s an expressive thing, her voice suits her lyrics well. I like Dylan’s voice for similar reasons.