I've seen countless times how I part jungle with the enemy one and see how my top fall to the same gank over and over, even when I tell him that enemy jungler is topside.
Also, I've seen a lot of times people engaging in bot/mid 5 seconds after see the enemy doing drake (Or top/mid doing it when the enemy does herald)
Of course, I have abused it also, and gank the stupid laner over and over only to see him fall to the same gank over and over (And see him saying "Jungle diff" when it was 100 % his fault)
In all that cases, the enemy jungler gets a free advantage ONLY because laner stupidness. So if you dont want to suffer the "BeTtEr JuNGlEr", just use ur brain playing.