Some commenters have questioned the tradeoff in the last post. I don't deny that you do give up a significant amount of damage by not using SoC. To my mind, though, the added flexibility and regeneration of SotC make up for it.
However, not everyone will agree with my valuation of the tradeoff. So let's examine some cold numbers.
Let's take a paladin with 1000 AP, a 3.8 speed weapon with 75 DPS, and +300 dmg/heal. Assume she is fighting a mob with 40% damage reduction. Also assume that she is spending all of her time attacking.
Let A be her Attack Power.
Let s be her weapon speed.
Let d be her DPS.
let P be her spellpower
Let R be the percentage of damage that gets through the armor.
Base dps = [d + a/14]*R = 87.9 dps
SoC dps = [ds + as/14]*0.7*7/60 + 0.29*P*7/60 = 55.6 dps
SotC dps = 306/14 * R = 13.1 dps
So basically, the SoC paladin is doing 143.5 dps compared to the SotC paladin's 101 dps. So by going SotC you sacrifice about 42 dps, or about 30% of your damage.
(I am ignoring crits, talents, and time spent not meleeing. Most of this affects both sides equally. I'm also ignoring Judgement of Command, as I don't think it would really be spammed by a melee-healing paladin. It does add another 30 dps or so, if spammed constantly.)
So the tradeoff becomes 30% less damage in exchange for 40% more Light/Wisdom procs, increased chance of renewing Judgements, and added flexibility in chosing when to start a heal.
Given that paladin damage is last on my list of priorities in a raid (though it is still on the list!), it's a tradeoff that I am willing to make.
As an aside, note that in either case, the majority of a paladin's damage comes from her base damage. The numbers seem relatively reasonable to me, though the weapon DPS is a bit high. You can always use your own values in the equations and see how your personal trade-off works. SoC does scale though, while SotC does not, so the better your gear is, the more attractive SoC becomes.