Maybe I'm just cynical, but this seems like the kind of thing they would have patented (not that it deserves a patent, just that they would have applied for one).
I just tried it in Chrome. View > hover over Encoding. Move mouse down over Developer and onto the Encoding submenu. There's a definite delay, although it's much shorter than Amazon's. Move the mouse over Developer in the other direction (down and to the left), and there's no delay.
I never appreciated this, yet it affects me many times a day. Really thoughtful UX design.
Maybe, but I'm not aware of Amazon being a patent troll in its recent history. I'm aware of the fight they had early on with one-click checkout, but since then?
