I was utterly confused the first time I walked into the E+ cabin on a UA 777-300ER. It was 2017 before the 744 was retired. My first thought was 'I thought this flight was a 777, they must have swapped in a 747-400.' Then I looked around and realized it was indeed a 777, and it was indeed 3-4-3. I settled into my seat and spent the next 13 hours completely incredulous that 3-4-3 in a 777 was even possible.
At 6'0" 200 lbs I'm bigger than the average American male but not by too much. The inch does indeed make a big difference.