Welcome to Lesswrong. We like rationality because it helps us achieve our goals. You might call it optimizing our lives.
You guys seriously should invest in general problem solving exercises. edit: to clarify. You discuss what ways of deciding are wrong. That's great. The issue is, one accomplishes one's goals by solving problems. E.g. you don't like to spend time driving to job? You can choose between driving and public transportation, taking into account the flu infection rate, etc etc. Great, now your life is few percent better. OR you can solve the problem of how do i live closer to my job, which has trillions trillions solutions that are not readily apparent (including a class of solutions which require high intelligence - e.g. you could invent something useful, patent it, and get rich), but which can make your life massively better.
Would just googling "problem solving exercises" be enough? What are you talking about, exactly?
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A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site.
(Note from orthonormal: MBlume and other contributors wrote the original version of this welcome message, and I've stolen heavily from it.)