I use a modified form of
Reborn, an all-encompassing UI package popularized by Nihilum. It includes
DoTimer, which works on HoTs and bubbles, as well as DoTs.
I think this will work as well as anything else, not to mention, it will show duration for not only heals/buffs on you and friendly toons, but it also shows remaining time for DoTs and debuffs on enemy targets.
Here is a quick screenie of what it does. Check the right side of my screen, just over Omen.
Hope this helps you, and /cheer for my first post =)
Edited because Imageshack links almost always break. Photobucket, ftw? Edited, May 17th 2008 11:50am by Acoe