I only have a couple of teams at 72.8 or so thus far, so heroics are a ways off for me.

However, I was browsing through the Naxx loot tables for fun the other day and was interested to note that the heroic 5-mans loot has equal item values to Naxx. This means they have significantly upgraded heroic item values in WotLK heroics as compared to BC heroics (where the item values were far less than Kara).

Given this, it makes sense that WotLK heroics would be harder.

We'll all get them eventually, keep it up.