Buffbot made Easy!

[Coreborn]

Even though you can heal, don't forget you are a buffbot. There is a reason horde got paladins in TBC.

Raids:
In raids you want to use greater blessings, and one of the best tool for this job is Pallypower.
Coordinate buff stacking with other paladins.

Normal version (does not work with auto-self cast)
http://addons.us.to/addon/pallypower

Modified version (works with auto self-cast)
http://www.mediafire.com/download/5iy8o ... yPower.rar

... and for our warrior friends.
MT and OT Should get this addon.
Its a more advanced version of salvation killer, that also removes other useless buffs to avoid buff overflow.
http://www.gamefront.com/files/files/5980420/br.rar

Instances, Battlegrounds, Party etc.
If you never played a paladin in early vanilla, this might not be familiar too you. But no further ado i introduce you to the old school method of 1 click whisper casting. As a paladin you want to use the addon whispercast, and configure it for lesser blessings and make sure people you play with know you are using it.
http://addons.us.to/addon/whispercast-0

All your buddies should get an addon called BuffMePal.
This is a keybinding solution for asking for buffs without having to manually write a whisper to ask for it. You simply set the source to get the specific blessing from, and ask for it with the press of a button.
http://wow.curseforge.com/addons/project-1059/

[Mimma]

And for other buffing classes (Priest, Mage, Druid ...) there is SmartBuff.

This addon lets you assign one or more groups. When a player in that group needs a buff (Fortitude, Arcane Brilliance, whatever), you just press the Buff macro. If 4+ people in the group is missing, a full group buff is applied.
http://armory.digam.dk/?sa=download.file.info&p1=1&p2=7

[JCarrill0]

... and for our warrior friends.
MT and OT Should get this addon.
Its a more advanced version of salvation killer, that also removes other useless buffs to avoid buff overflow.
http://www.gamefront.com/files/files/5980420/br.rar

LazyPig also does this.