These do seem to always involve the newer generation of heavies (777, 330, 380). Is there something about their relatively low-slung cockpits (compared to the 5-story throneroom of a 747)
FWIW you can see your own wingtips from the "throneroom" of a 744...you can't see your wingtips from the flight deck of a 777 ( unless you open the window
). Not making excuses, but it certainly doesn't help with judgement and perhaps leads to increased reliance on the questionable "fact" that following taxiway centreline markings will always provide wingtip clearance.