The Druid is an interesting beast. Between Wild Shape, Animal Companion, and his particular brand of spellcasting, he has a huge amount of sheer firepower, but unlike the Cleric and especially the Wizard, he doesn't generally have as much combat versatility. For example, an ubercharger with an AMF on him is a much bigger problem for a Druid than a Wizard. The Druid's best tools (that is, the ones that give him the versatility he's missing) are Craft Contingent Spell and Shapechange. Shapechange can get him Wizard casting, but by the time you're fighting a Druid who uses Shapechange for Wizard casting, you're not really fighting a Druid anymore.
Part of the problem with Tier 1 classes is that once they're highly optimized, they aren't tactically interesting anymore. In low-optimization D&D, the classes have their strengths and their weaknesses; a Wizard is highly fragile up close and relies on others to defend him, while the fighter has relatively little ranged combat ability, and has trouble with high-AC opponents. In high-optimization D&D, the fighter still has trouble at range, but the Wizard is effectively invincible at all ranges and is simultaneously almost arbitrarily dangerous. There's not any maneuvering you can pull off, or any secret you can learn, that gives you an edge on him. He just wins. All the time. The Druid, being a Tier 1 class, is the same way. Once you get into Craft Contingent Spell and Shapechange shenanigans, he stops having weaknesses like 'AMFs shut him down' and 'he lacks good divinations'.