Gonna have to disagree with you on that point, it certainly isn't a must have as 90% of DoTs have Bloodtalons anyway and it's easy enough to remember which DoTs have TF considering its short cooldown. I do have weakaura on standby for anything that people decide might be helpful (The previously mentioned Imperator intterupts/Garrosh Malice..) just I don't actively use it for anything.
Most of my Druid info comes from TFD (The Fluid Druid) as that's where the 'best' ferals seem to be. I check the MMOChamp thread every so often too but realistically it doesn't have as much info nor is it as reliable, in my opinion. Still a good read. It's hard to give a general reading on when I use TF though generally I just use it asap after it's off CD and I have less than 35 energy (To prevent capping). This goes for when Berserk is up too as you can still become energy starved as I've found.
