TOD:
I think I was there for most of the "firsts"
1952 Cinerama This Is Cinerama
1953 Cinemascope The Robe
1955 ToddAO Oklahoma!
1959 UltraPanavision (70mm) Ben Hur
1959 SuperPanavision (70mm) The Big Fisherman
1963 Cinerama 70mm It's a Mad, Mad, Mad, Mad World
(I actually saw the second Cinemascope film, The Egyptian, before I saw the Robe)
(I also thought the second ToddAO, Around the World in Eighty Days, showed off the process better than Oklahoma!)
der Brucer