Heh and I played each and every one of those games.
I remember when I first saw Wolf3D. My brother was playing it and I just didn't know what I was looking at. I didn't realise it was a first person perspective, so my brain was trying to process this as something like a 2D platformer game. That was a weird experience. It wasn't until my brother pointed out the first person perspective that it all clicked. And I was amazed.