Originally Posted by
Varyk
I would recommend the addon DKDiseases, it shows timers for your diseases, as well as the strength of them, compared to what your current diseases are. (tick damage, %+/-, etc)
It's also color-coded to show when you should/shouldn't reapply for a dps increase (red when you shouldn't, yellow when it's about the same, green when it's a significant increase). You can adjust the threshold at which it changes colors (8% increase in strength rather than 10%).
For instance, you Plague Strike, then after your trinkets/cds are up, it might turn green and show 150, meaning if you reapplied dots they would do 150% the damage they are currently doing.