I've done a lot of travelling between Australia and Europe via Dubai on the A380, and I've definitely noticed the same thing, you can really feel it. You can also see it on the interactive map thing on the ones that have the 'virtual cockpit' view - the vertical speed goes positive for a bit, then back to zero, then negative for a bit, then back to zero, and repeat, all 10 hours or so of cruise on the long leg!

The 787 is nice but I find the seat width quite cramped in economy, and unfortunately premium economy isn't great value either to pay or for points upgrade on any of the airlines I fly...