I am not sure if comparing the statblock of a PF dragon and the statblock of a 4e dragon is a fair example regarding it's non-combat abilities. 
There are two full books for 4e talking specifically about dragons and their ilk, it discusses their motivations, their plans, how their lairs look, what they like and dislike, society, religions, etc.  
It's just that.... well..... they don't need that stuff in the statblock for combat.
4e dragons are certainly NOT just big dumb flying lizards, unless the DMs decide that the creature is just the statblock.  That would be true for any edition.
Here are just three paragraphs from the Blue Dragon entry in Draconomicon: Chromatic
This oooooooooozes great ideas for non-combat RP moments, but big dumb flying lizards?  Nah....