Here are a couple of great add-ons that I use.
Awesome Warlock add-on with an Intuitive UI. This add-on allows you to keep track of Shards, Create Stones and even cast some spells and summon demons from one small ui button set. Itr also allows you to have custom messages for Summoning Demons/Steeds and Summon Toons which a very simple to edit and change.
A must for any class that deals in removing De-buffs. Simple to set up, Allows the setting of Ignore and Priority lists for decursing. If you have trouble doing decurse work and want a simple, just click the button type of mod, this one is for you.
As far as I am concerned this is the Ultimate when it comes to Paladin Add-ons. Healing, Curing, Buffing and combat. This baby does them all with a relatively easy to set up Configuration UI and all manuals included in the Add-on Archive. Also integrates with Titan Panel
4. Whisper Cast
A very useful mod for players that need to cast buffs. Simply load up Whisper Cast and either create a macro to mash or activate the snazzy Titan Panel Button. To use is simple, when another players wants your buff they simply send you a tell with a specific keyword to be added to your WC Queue. Then simply either Mash the Macro or the Titan Panel Button to cast a buff from your queue. Auto Targets player as needed. Works for Paladin/Priest/Shaman/Warlock