I've went without BoK, but I did start with two friends as a paladin trio. Pre-WotlK, the holy had it, now, the ret is going to have it.
For my personal choice, I don't think 5 points are worth it for a talent that I'd only use on myself in boss fights.
The biggest argument for taking it imho is that it just needs to be present in a raid, or you're really missing out. This may leave the prot in the uncomfortable situation that he brings BoK for everyone else at cost of not only 5 talent points, but also one of his two favourite blessings.
So, I can certainly understand both camps, and would argue it really depends on whom you are regularly grouping with.
Cheers,
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