I'm partial to elves, and plan on grinding up druid as secondary. Focusing mostly on the shared skills with TP.
What classes benefit most from druid as a secondary (and work well with druid as the main)
Ok so im going to let you know about the classes a bit
I have tried
D/m
D/wd
D/s
Druid/mage : is a fun combo, it can mainly heal and do some kind of damage (from now and on im going to let you know Druids cant be good dps, not even D/r). It has en extra regen but since the game split it into healing/ "bit of dmg" it will never do the amount of heals a D/s or a D/w will do. For been an excellent Druid/mage sit down a bit and learn your skills because solo healing will not be easy (but not impossible, you can do it, it just take skills) it can heal endgame.
Druid/warden: sadly this class could have a lot of potential but it is broken in some ways. Healing ripple only heals three players including yourself which makes it was for a trio.. but the broken part is that it will keep cutting in a half the heal for eachperson, (first player 16k second 8k third 4k) which is annoying, Briar shield is a good elite but only for tanks. the 50/50 its HELL broken lol good thing is.. no one can destroy it. 1k per tick? common fix it!. Well to finish with this class combo.. D/wd would be one of the best druids if the elite would be fix but sadly im going to be really honoest... for solo heal it will do down down down and hit the floor as the druid encyclopedia says.
D/s : this is the last combo i have tried and im sticking with it and maybe going D/m for some easy solo healing and D/s for difficult solo healing. D/s is the best single healer druid by farrrrr. You can stack 4 different hots on a player and trust me they love it... you can heal yourself by healing others which is a great advantage (makes it easier). In conclusion a D/s can easily out heal any other combo, it also has a group cleanse which is really needed in higher instances... its fun and powerful.
These combo i havent tried but i know a lit bit about it.
Druid.warrior : Awesome group buff! all of the endgame phy dps loves it! (awakening wild). this is the only healer that can heal without mana, it is able to heal with rage with one elite that is a group heal with 4 sec CD. Cons, its a very risky class to play and so far one of the most difficult. Not impossible! i have heard that once you can use to it... its really easy.
Druid/rogue: This combo is broken in both ways dps and healing. Druid/rogue is the worse healer next to P/w (both of them has an elite to decrease their heals outcome). It is suppose to be the "magic dps druid" but the problem is that it will never go toe to toe with a mage.. it needs some fix for sure. not an endgame healer nor dps.