NPTD cooldown is actually 1 minute, which is even better.

back on topic, i personally have found that casted heals are better than these proc heals, by a large margin. I can heal myself reliably for 1k with battlefield medic every 8 seconds from the warlord tree, whereas if i got a boea proc, it would be a ~400 heal at my gear level.

12 Paladin offers another heal in Light's Balm, and that one is even more spammable when you need emergency heals