PWS is still too expensive. Do you realise what blizzard have done with it?
Before a PWS would set you back 18.3k mana or so and would return easily 35k on average from rapture with 13k spirit due to the scaling from spirit procs. Now the same PWS will cost you 13.7k mana and will return 19.5k mana. With the old model casting 2 PWS per rapture period would cost you 1k mana. With the new model casting 2x PWS will now set you back 6k mana. Blizzard did not make rolling PWS cheaper. They made it more expensive. You won't be able to use much PWS and using it in a clump before a raid spike is just too inefficient. You need to make use of borrowed time to make PWS worth casting. Otherwise its just a tool for ooming yourself fast.
They nerfed too much too fast and they didn't give discipline any new way of healing. All they did was buff binding heal and penance and effectively remove PoH from our repertoire, because right now it is just too weak and people who think crit will make it better are in for a surprise.