As Mashashi mentioned, a BLM triple-flaring should be about the only time you lose hate as a PLD on AoE with the changes they made. (Exempting things like ranged mobs that just wanna sit back out of your immediate melee range -.- Blasted monkeys...)

The major problem is that quite a few new/up-and-coming PLD's don't look over their full skill list. You have a lot of utility skills!

If I'm doing a speed run, I'll hit Convalesce, Bloodbath, and then hit Circle of Scorn as soon as everything is grouped up. That healing, however minor, does a TON of threat.
Then hit Fight or Flight, Flash about 2-3 times before using your mana regen combo; Fast Blade -> Riot Blade -> Flash.
Depending on your group's speed in killing, you may need to double flash now and again, but overall... that 'opener' with the combo following means you won't have trouble with AoE threat.