The problem with happiness for me is that I don't go into a game thinking: I'm going to eventually own this continent. So when I make those early game decisions about religion and my starting policy tree, I'm not always sure which one to choose because I don't know where I am going to end up. Sometimes I will go with a rich tall empire, and get mercantilism. Low and behold I get into a war and begin expanding a lot, so I got lucky because mercantilism has a very strong happiness booster. But, what if I had gone Honor? My war would have fared better, but no happiness in sight.
Rather, I have a basic idea of what I want to do, and hopefully the game unfolds in a way that helps me use that. I started a game as the Dutch last week and it put me in the middle of the desert. My neighbor, Egypt, was plopped down in the middle of a marsh. Go figure.
Maybe I just need to adapt the attitude of being dedicated to one style of development in each game I play, but that is just boring to me. I like to adapt to the given situation.