My druid used to duo alot with my best friend's cleric, I know that's an odd combo, but he would get invited to lots of dungeon groups. Guk mostly. If they had room for 2 he would insist they bring me along. Some groups were not so excited about having a utility class when they could have a dps caster or melee instead.  
 
Needless to say I proved my value in many groups. Like so many other posters have noted, we can do quite a bit. Damage shield, buffs, snares, roots, dots, even evac when things get hairy. We won't be best for healing or dps, but we can do a little of that and everything else. 
 
Played druid as my main since 99. Enjoyed every last minute, would not change a thing. 
		
		
		
		
		
			
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				Mindwarp - Gnome Enchanter 
Dunkler - Halfling Druid 
			 
		
		
		
		
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