In defense (gulp!) of Lebron, though - I think we all have been guilty of calling a play "The Greatest" in the heat of the moment.
I think Lebron is guilty of this in this case, and means no disrespect to the Larry's, Magic's, Stocktons, Kidd's, Rondo's etc of the NBA.
Dead on, right here. "That was the greatest (fill in the blank) ever" is thrown around kinda loosely, by just about everybody. Especially regarding unquantifiable things like this. I'm sure any pass/shot/dunk/etc. that somebody will label the greatest ever, somebody else will say no this other one is better. Nothing egotistical, crazy, etc. on LeBron's part here.
I think bottom line, I've seen alot of those Bird and Magic passes before, because they come up all the time when showing highlight reels of the "greatest" passes. Now we'll probably see that Wade-to-LeBron pass in those same highlight reels. Just like 10-15 years ago, I always saw the same Dominique, Jordan, Dr. J, etc. dunks when someone was showing the "best dunks of all time" and I now I still see those same dunks, but with a lot of Vince Carter added in too.
Speaking of greatest passes, although not in the NBA, and with a very lenient set of rules, that And1 Rafer Alston tape, I've been watching that tape for like 12 years now, still makes me go wow.
http://www.youtube.com/watch?v=ul-t-tAEvNs