Druids are really solid.
Only thing we might struggle with are heavy burst on the tank that our HoT can't handle.
The only thing that really helps in those cases is being specced in Cenarion Ward (extremely good for mythics), Ironbark and possibly Regrowth spam.
Stonebark talent helps in this case, although I tend to favor Flourish. The latter can be combo'ed with Cenarion Ward for bursty tank healing, but is also very versatile in other situations.