I’m 5’8”, and while I don’t remember having a problem wondering about the cabin, pretty much every time I sat down I banged my head on the overhead bins.
I managed four trips, two LHR-JFK, one JFK-LHR and one LHR-BGI. That last one was meant to be a surprise for the then GF, but she was upset that we were leaving at lunchtime on a Saturday (only one weekly rotation to BGI) saying we should’ve chosen another day. Somewhat regrettably I had to “ruin” the surprise.
I could never see the point of the eastbound flight, I always felt I was losing a day, and preferred F over Concorde in the direction, not that I often had the option of course!