The Conquerors adds the ability to queue farms for automatic replanting, allowing for quicker and more efficient development. Now, after villagers build a resource structure (like a mill or a mine) they'll immediately start gathering the appropriate resource. Building walls and getting busy (working not dancing) comes much easier for them. First of all, villagers are much smarter.
The Conquerors improves the existing AOE2 gameplay in a number of ways. With new cultures, maps, units, technologies and more, The Conquerors manages to enhance one of the best RTS games around. What can be said of an expansion pack? In the case of Age of Empires II: The Conquerors Expansion, 'Hell, yeah!' comes to mind.
