Personally I remain unimpressed by spell speed as a healer stat and get rid of it wherever possible. If you know the fights, you already know when and what you should be casting and are planning accordingly.

It may not be utter trash like it was before it helped with DoTs and HoTs, but even from a DPS perspective it's not as good for healers, who don't generally chain-cast nukes over extended periods and thus are less likely to get "extra" casts from additional spell speed.