Brethren RaidFrames contains various special features that will help you do your job that much better. Here are a few of the features that will greatly help you in your role.
Since around 2.3 BrRaidFrames has been able to track HOTs from all the healing classes. By default the total number of HOTs on a player will be shown on the unit frame. In addition to the number, if one of your HOTs is on the player then the number of HOTs would change color and you will get a timer bar the represents the amount of time left for that hot. For druids, since they have more than one HOT have the ability to select which HOT they wish to track(timer bar) via the Frame Settings menu.
In release 30 three new additions to this feature have been added. The first being the ability to monitor your lifebloom stacks rather than the total number of hots on a player. All you have to do is select lifebloom to be tracked and you will see your lifebloom stacks. The second is the ability to monitor grace on players. If a priest decides to track grace then they will see the number of stacks for grace as well as a timer bar for each player. The third is the ability to monitor Weakened Soul on players if you are disc speced. A red border will represent the time left on Weakened Soul. This will be very helpful for disc priests who must maintain shield rotations on tanks.
For bosses that have important debuffs to be wary about, BrRaidFrames will highlight those players that are effected and place a red timer bar along the top representing the time left on that debuff. In the figure above, phayte and succysuccy are both under the effect of the curse in the kalegos fight. This is helpful for both decursers and healers due to the nature of the curse. In addition to debuff highlights BrRaidFrames comes with a series of different boss specific windows that are aimed to assist in the execution of the fight.
The window above was designed to help our decursers on the Kalegos fight. Player are highlighted blue when in the spectral realm. The blue bar / time represents the time left in the spectral realm. The purple bar / text represents how much time is left on the curse. There are various boss specific windows for different encounters, more will be added when the need arises.

The missing buffs window shows how many people are missing the various castable raid buffs. When you click on an icon it brings up a more detailed window that shows who all is missing that specific buff.

When left clicking on a player in this window (if you are a priest in this case) it will cast a single fort on that person. If you right click on a player it will cast prayer of fort. These windows make buffing extremely fast. Thought in 3.0 it is not something we really have to worry about since prayer will be raid wide.