It’s not a HUGE list of core abilities. It’s one or two abilities for each class, out of the many that they have. Again, here’s a friendly list to help dispel your BS.
Frost DK:
Number of AoE abilities: 8
Number of AoE abilities 5 capped: 1
Unholy DK:
Number of AoE abilities: 10
Number of AoE abilities 5 capped: 1
Havoc DH:
Number of AoE abilities: 8
Number of AoE abilities 5 capped: 1
Balance Druid:
Number of AoE abilities: 8
Number of AoE abilities 5 capped: 1
Feral Druid:
Number of AoE abilities: 6
Number of AoE abilities 5 capped: 2
BM Hunter:
Number of AoE abilities: 6
Number of AoE abilities 5 capped: 2
MM Hunter:
Number of AoE abilities: 7
Number of AoE abilities 5 capped: 1
Surv Hunter:
Number of AoE abilities: 4
Number of AoE abilities 5 capped: 1*
*Butchery replaces Carve, and they don’t increase their AoE cap above 5.
Arcane Mage:
Number of AoE abilities: 9
Number of AoE abilities 5 capped: 1
Frost Mage:
Number of AoE abilities: 9
Number of AoE abilities 5 capped: 0
Fire Mage:
Number of AoE abilities: 12
Number of AoE abilities 5 capped: 0
WW Monk:
Number of AoE abilities: 9
Number of AoE abilities 5 capped: 0
Ret Paladin:
Number of AoE abilities: 7
Number of AoE abilities 5 capped: 1
Shadow Priest:
Number of AoE abilities: 7
Number of AoE abilities 5 capped: 1
Assassination Rogue:
Number of AoE abilities: 3
Number of AoE abilities 5 capped: 0
Outlaw Rogue:
Number of AoE abilities: 1
Number of AoE abilities 5 capped: 1
Sub Rogue:
Number of AoE abilities: 4
Number of AoE abilities 5 capped: 0
Elemental Shaman:
Number of AoE abilities: 7
Number of AoE abilities 5 capped: 2*
*Lava Beam replaces Chain Lightning if the Ascension talent is selected and used. Both retain the same AoE cap of 5.
Enhancement Shaman:
Number of AoE abilities: 6
Number of AoE abilities 5 capped: 0
Affliction Warlock:
Number of AoE abilities: 4
Number of AoE abilities 5 capped: 0
Destruction Warlock:
Number of AoE abilities: 6
Number of AoE abilities 5 capped: 0
Demonology Warlock:
Number of AoE abilities: 5
Number of AoE abilities 5 capped: 0
Arms Warrior:
Number of AoE abilities: 7
Number of AoE abilities 5 capped: 2
Fury Warrior:
Number of AoE abilities: 3
Number of AoE abilities 5 capped: 1
As you can see, with the exception of a few specs, notably Fury Warrior, Outlaw Rogue and Survival Hunter, all specs have a significant number of AoE abilities or talents at their disposal which are not capped at 5 targets. If you want to AoE? You can, with ease.