I've written about most of my large format film experiences (Cinemascope, standard 35mm, is not large format, but Cinemascope 55 was). I wrote briefly about Aromarama, which I saw, in the chapter about the other smell film, Smell-O-Vision, in Kritzer Time.
Scent Of Mystery was my first Todd-AO film. I'm thinking Ben-Hur was my first 70mm film experience, also at the Egyptian. I have to ponder that, though. Otherwise, I saw all the big films, but in 35mm printdowns.
The Ten Commandments was shot on large format film (VistaVision) but never shown that way - like all VistaVision films save for two, it was printed down to 35mm.
Cinerama (three panel) wasn't actually a large film format - it was three 35mm projectors.