I was in GER in 2006 specifically for the WC and the "alles in Ordnung" Germans were really frazzled. Trains were late, airports were jammed. It seems they THOUGHT they had every detailed covered but they didn't.

So if the Germans struggled then I can only shudder in fear as I think of how the Brasilians are going to cope with the massive influx of tourists. (and I'm not even factoring in the yet-to-be-completed stadiums)