I find this, along with Protective, one of the weaker traits in the game. It's cool to get quicker great generals (I wish they could start Golden Ages but you can't have everything I suppose) but I'm a bit stumped at the quicker settler production. All it seems to do is goad you into thinking you can get settlers out quicker than anyone else and place more cities. This just leads to early bankruptcy though if not very carefully managed. At least protective is always useful if you find yourself on the receiving end of Aztec/Zulu aggression! What's the secret to effective usage of Imperialistic?