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In 3.5, the druid was about the only class people didn't leave in favour of prestige classes, especially before the introduction of the planar shepherd. Most of this was due the wild shaping rules.
Now, the druid is about the only class not worth taking to level 20. After the 15th level all the druid gains are a few more wildshapes a day (as if 6 won't be enough) and the ability to wild shape at will at level 20. Even the animal companion doesn't get that much better in levels 16-20, so most druids would be much better of taking levels in a prestige class that grants divine spell progression.
So, in my opinion druids need some additional class features on level 16-20, maybe some power increases in wild shape like those from the warshaper in Complete Warrior.