I clearly remember seeing it in 70mm Cinerama, and being just blown away. The digital restoration is fine, but they’d better not disturb so much as one of Kubrick’s pixels!
The original didn't have pixels. It had dye molecules, positioned by microscopic crystals of silver. Not exactly analog, but certainly not the rows and columns of optical samples - each representing a fixed-point integer value of brightness in one of three color bands - that we have to tolerate with todays digital imagery.
And you're right about being blown away by the 70mm film format. I remember being amazed by the width of the image. I saw it from about the ninth or tenth row, and it just seemed to be too much to take in all at once.
Also, the sound was incredible. The opening title sequence, with the thundering chords of Also Sprach Zarathustra almost made me dizzy; I had never heard anything like it.
I only wish I could see it in Cinerama... oh well.