The biggest mistake a lot of people make (me included, in the past) is relying too much on the info posted in these forums. A lot of it is good, sound information, but it's easy to become obsessive over it and to start to conjure an idea of your upcoming trip that is just unrealistic, one that your trip just can't measure up to. Which will, in turn, lead to undue stress and even borderline depression.
No, the DIS is good, but, as with everything else, in moderation.
Exactly!!!!! You always have to make room for the unexpected. When planning so much you miss so much.