Today I cannot think of any airline or any aircraft where anyone in their right mind could use the words 'economy' and 'bearable' together when talking about a 12 hour flight.
Have you actually flown on an A380, or are you just feeling too entitled to ever succumb to economy?
I've flown in all classes and on a range of airlines (LH, AF, UA, KL, SR), and specifically on flights between Europe and the West Coast, many times on both 747 and A380, and while certainly not ideal, at more than 60 years old I am perfectly happy in economy on an A380, especially if I am paying out of my own pocket, and think it is the most comfortable long-haul plane I have ever flown. Cannot comment on 787, as I have not flown one yet.
Also, the live video stream from the tail mounted camera is awesome.