i finally managed to get my druid team working very well in instances. i was ready to abandon my druids for PVE and setting up my DK Team when it hit me. The DK's are successful in PVE because they're all four in blood-tanking spec, so why not go 4x bear?

Instead of wiping on nearly all the trash groups i now complete (normal) instances in easy-mode.
The trash groups i used to wipe on now don't even require healing anymore.

While i did about 8-9K on the cats, i do 6-7K on the bears, but since the bears require much less healing, the fight can take much longer without any problems.
Bears are also much easier to manage. This is what i came up with as a DPS rotation:

Single target:
#showtooltip
/startattack
/castsequence reset=target Thrash, Lacerate, Mangle, Lacerate, Lacerate, Thrash, Lacerate, Mangle, Lacerate, Pulverize

Multiple targets:
#showtooltip
/startattack
/castsequence reset=target Swipe(Bear Form), Thrash, Swipe(Bear Form), Mangle, Swipe(Bear Form), Lacerate, Thrash, Swipe(Bear Form), Mangle, Lacerate

They're probably far from optimal, but they get the job done.
i open the fight with a demoralization roar and 3 faerie fires on the 4 bears. (why use the improved faerie fire talent when you got 3 druids to cast it )
And i mixed in a Growl every 2 seconds on round robin, to spread the healing a bit.

There hardly is any information on dps-ing with bears, which makes this team even more interesting.
Only thing i good find is this very helpful thread:
http://us.battle.net/wow/en/forum/topic/2456445814

Videos will follow as soon as i've done some heroics