OK, ok...
-Do you like green eggs and haste?
No, no, no! I do not like them inside Naxx, who needs fast around undead packs? I do not like them in frozen jails, I prefer to cast like sleepy snails! They did not help in ToC, I bring my own haste, so let me be!!!
-Try them, try them, you will agree, they will help in ToGC...
If I try them will you stop? Sam I warn you, I'll call a cop!
...
Say, this haste is nice, I daresay. I could eat this every day. Tanks aren't waiting to be healed, I can still toss in my shield! My bar stays blue and his stays green, that is what I have seen. Thank you, thank you Sam I am. Thank you thank you... I'm off to spam.
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Srsly, I geared about 14% haste (around 1.2 second Fheal raid buffed w/o BT) doing ToGC, and it helped out. We are working on it w/o a pally healer and I was falling behind way too much on the tanks. I have no gcds to spare to the raid once impale starts stacking, and I was able to gear into a haste position with the Ony helm.
As a previous advocate of not adding haste after a BT hasted 1 second Fheal, I do hereby publicly announce that I have changed my mind, until of course, I change it back. =)