I've tried every addon and for some reason I just can't get away from Blizzards default Raid Frames. I have 3 issues (one of which I've solved) with the default raid frames,
1) They use a progress timer. I would love a numerical countdown so I have a better idea of when to refresh my HOTs (I play a RDruid)
2) They are CRAZY small icons
3) They only show 4 buffs at a time (I was able to get around this by using an addon called BiggerDebuffs but unfortunately it doesn't make my buffs bigger)
The only addon that I can find that makes my HOTs bigger is the addon Blizzard Raid Frames - Bigger Buffs and I'm just hoping someone can update the addon for 7.0.