It all comes down to personal preference, I happen to be an advocate of the EP build because A) it allows my LB's to never miss thus giving me lots of Mana to play with and B) actually causes dmg.
Now I know that many people say well you should not be using so much Mana etc, however there are many occasions where you are left not really doing anything and casting a LB here is a very good option. I also have gone a full Spirit Build as tjhis further allows both myself and fellow healers greater Mana Regen.
World of Logs - Real Time Raid Analysis
This is our latest Cho'gall Kill, you will note that by gearing for Spirit and an EP build this has not gimped my output in anyway, in fact probably increases in.
In addition to being able to heal from start to finish without any downtime I also contributed to dmg. Not a huge amount I grant you, however on fights where everything matters it makes a huge difference. For example, had I not caused 600k dmg (300k in LB's) we would not have killed Cho'gall, it was that close.
However my caveat to this is that you need the gear to be able to give you the base int which means you still hit hard enough. Fortunately at the point where an EP build starts to help you as a healer, you are at the level where you are obtaining such gear. I don't think that an EP build is required when first entering into HC's as the requirements are not as harsh on Mana as they get later in the tier.
So in summary, until Mana becomes an issue for you, you won't need to go down the EP route, but once it does its a lovely thing to have it there to allow you to adapt to the greater demands placed on you.
In regards to the whole "instant golf wolf" issue, I personally very rarely used it, but I did find the +movement speed to be useful, but I have also not really found a fight where it is missed, but then I do have rocket jump for those "Oh Crap" moments.