Regular flyer SYD to EWR and back usually via SFO in Y which is around a 24 hour door to door trip for us.
We usually arrive in reasonable condition.
Find the 787 fairly comfortable on the international leg in comparison to the 777 (but still miss the 747).
The seat is supposed to be tighter but I haven't noticed that. Am 185cm and 110kg. We always book aisle seats in the middle.
No complaints about IFE or food but do take my own snacks just in case.
I find a lot of the discomfort can be 'in the head' and some mental preparation is a good way to go.
After all it's only 14 hours, not a life sentence.