I haven't flown the 777, but did once have to power one up and play with things on it, and found its systems completely different to the 737NG (on which I'm rated), but logical.
I was enormously impressed by the ease with which the electronic 'flight bag' worked, and the intuitive nature of the touch screen displays and their logic.
Notwithstanding the apalling design flaw in the fuel system
, I thought it looked like a lovely place to go to work (if you have to go to work, that is...)