LEARN TO BE SELF SUFFICIENT.
In WotLK if you are a burden to the healers of a raid by using SoB to "get some extra mana" be prepared to be replaced quickly. With the changes to the class and mechanics, barring being nerfed into oblivion again, there will be a larger pool of Ret Paladins out there and among those will be ones that understand their new role.
Ret Paladins are not meant to be rogues, doing nothing be beating on the mob that is being tanked. If this is the only thing you like to do you will need to reroll as your Ret Pally will be unwelcome on raids. And this is even more true of Ret Paladins that pretend they don't have heal spells & drain the mana of other healers.
Let the rage addicts and rune monkeys suck down the healers mana, Paladins do not need to anymore and in fact will be able to help keep those fools up, while still pumping out good numbers.
The new Retribution Paladin will be doing damage to the mobs, but will be making use of all their other abilities as well. Judgements of the Wise and Sheath of Light are required and ensure that a Ret Paladin will be able to not only put out solid DPS but be able to toss Heals / Hands / Blessings and use offensive spells all without requiring any healing from the other healers for mana.
Learn to love SoV, master keeping the Holy DoT up at all times while using all the other abilities you have during fights. As long as you keep 5 stacks on the mob and judge it every 8 seconds you will be able to use all the other GDCs for anything you want and have solid DPS. Ret Paladins new goal will be to have a solid placement on both the dmage AND healing meters, not just damage.