How to benefit the most from drawing spear?

[Ashelia_Ferron]

It does, but those abilities have lower cooldowns anyway, so the benefit is marginal.

It might also mess up their rotation if they're popping certain oGCDs in line with buffs.

[Sylve]

It does, but those abilities have lower cooldowns anyway, so the benefit is marginal.

It might also mess up their rotation if they're popping certain oGCDs in line with buffs.

At the same time, it may help to line said Abilties up better. Even shaving a couple of seconds off a cooldown can lead to a good chunk of extra damage over the course of the entire fight if you do it regularly enough.
I'd say it would be worth using when its available.
If anyone does have an issue with the lowered cooldown not lining up 'properly' with cooldowns, nothing is stopping them from simply holding off for a couple of seconds to get it lined back up.

[VitalSuit]

Any job that has a low CD oGCD ability also gains some benefit from Spear, though it's certainly nowhere near the DPS boost Arrow or Balance would give them. A DPS boost is still a DPS boost regardless and if you can't use Spear on yourself, here are a couple of jobs that come to mind:

DRG
Jump (30s)
Leg Sweep (20s)

NIN
Ninjutsu (20s)
Juggulate (30s)

MCN
Quick Reload (30s)

MCH
Quick Reload
Gauss Round
Blank
Head Graze