I’ve been up the railway and looked out of the viewing windows, which are just up the line from the famous rescue window. When the train passed the window my hair stood on end. It’s impressive looking straight down the face, you’d have to have your head well sorted to spend a couple days out there.
Have also done a 10 minute helicopter trip right along the face to see the windows from outside, it was hard to spot them as they are so tiny in that mass of rock and ice.
The nearest I’ve ever come to actually experiencing such a big airy place was at the beginning of the Vallee Blanche ski run when you emerge from the Aiguille du Midi and walk down the snow ridge.