Generally druids get the same healing spells as a cleric only one circle later. They do not however get the complete heal spell that is cleric specific. Wizards are powerful casters whose mastery is in dishing damage. Wizards also have great teleport and group teleport spells up to and including teleportation into other planes. Other classes will trade positions from time to time as they get new and more powerful spells however druids never fall too far behind.
Rangers are the other nature loving class in the game.
They also have the forage and tracking skills. Druids get these same skills only at later levels. This means that druids will not have to worry about spending money on food or water or returning to town as a neccessity to buy these products. It also means that druids will have a leg up over every class other than rangers when it comes to tracking down outdoor animals. Likewise animals are not naturally agressive to druids.