Hmm. I hadn't seen it either until a couple of years ago. I was so disappointed, probably because my expectations were so high.
I'm sure if I'd seen it at the cinema in 1973 with Tubular Bells on surround sound and little idea of what to expect, I'd have been overwhelmed. Well, I was two years old... but you take my point.
On the telly, 30 years later, it just doesn't have the same impact.