It's not casting. It's taking aim/charge time. All the BRD weaponskills didn't suddenly become spells. They just take slightly longer to fire because you're taking careful aim.
Sadly I think much of the problem could be fixed if they simply renamed the "waiting bar" for BRDs to be "Aim bar" or "Charge bar".
As I said before, for those who weren't needlessly hyperactive bunnies in 2.x, nothing changed with the introduction of WM.
