To mirror Ralvenom above, I feel people don't really understand the way to use Divine Veil best. I find it one of the more useful skills in my repertoire. I generally find good spots to use it on just about every raid encounter. It's all about adding additional stability to the group.
The onus isnt on the Healer to suddenly cast a heal on the tank to proc it. The onus is on the -tank- to know when they're being healed so it gets procced automatically. The tank has to learn the fight, and then weaves in Divine Veil at points of heaviest AOE damage, and needs to learn how their healers heal in order to ensure it procs.
It's also not really an AOE shield on its own, think of it more as a way to boost the aoe heals of your healers during moments they might otherwise struggle with (particularly back to back AOEs, or a single huge tera-flare esque like Thordan Ex's limitbreak).
Some examples - when grouped up for soaking the double cleave on the entire party in the hand phase in A3S. Pop one after the first digititis part and when everyone is stacked infront of it, you'll get healed anyway as there's so much AOE healing needed and it'll fire off and hit everyone. Thordan Ex, in the first phase you can cast it after the thunderstorm then run into the group to soak the Dragon's Rage, and the heal that healed up the Dragon's Rage will pop your Veil so it's up to soak the following Ancient Qaga. Also, when tanking A2S and standing near your co-tank and both taking lots of damage, popping your divine veil as you're being spam healed is the same as an instant cast stoneskin on the other tank.
Divine Veil is -not- good if you just pop it when people are spread out and then shout at your healers to heal you. It's mostly about knowing a fight and knowing how your team's healers heal, and then using it as a way to enhance their AOE heals on the roughest moments, often when you have multiple AOEs going out at once. Just remember that Divine Veil is procced if you get hit by a Medica or Succor, so often it's easy to just pop it before you know one of those is comign, rather than rely on a healer specifically casting a single target heal on you.
That said, I'd certainly not argue against DV getting a buff (ideally a shorter cooldown, maybe a bigger radius or a boost to 15% or something). It's okay as it is and I find I get a lot of use out of it, but it's not exactly overpowered.