Moderately tall whingers
I'm over 6ft 5 in the old money and I still manage to get to sleep on economy seats.
After a lifetime of travelling in school buses, army beds, doing a 1500km trip in a BMW 3 series with the back of my head against the ceiling and other evils of a world designed for gnomes, economy seating isn't too bad.
If I get an isle seat I just leave my feet in the isles and get shinned a few times by the service staff with their trolleys. Otherwise I push my feet under the seat until they sort of "click".
That said, the newer style seating they have on Air NZ economy these days is just bloody luxury. Lots of space under the seat in front to stretch out.