My wife had a terrible fear of loosing me in this station, afraid she would loose me and never find me back :-) .
It felt like the biggest station we knew before, multiplied by 10 and then molded and warped like a ball of dough.
IIRC there is a multi-level bus terminal at this station too that we had to use to get to Narita airport, which we had never seen before for a bus terminal.
Would love to go to Japan again, but when the kids are a bit older and we don't have to fear loosing them in this station.