UPDATE! Wow I just discovered something by accident. The 2000 UK DVD actually has original Deems Taylor intro, according to this: http://www.ign.com/articles/2000/11/17/fantasia-anthology
I had a Pal VHS that had the original narration but unfortunately I’ve sold it some time ago.
Although I’m one of those that always wants the original film, in Fantasia I don’t mind much because it’s the animation that counts.