On occasion I do have a tl;dr post, and that's just my style. I tend to go on and on, letting my line of logic sort of establish the context and content of a post. Generally I just open with my answer and elaborate. I do try to line break from time to time to allow digesting of various parts.
That being said, I don't totally dislike tl;dr posts. To me, a tl;dr post is so much more than just a huge wall of text, it's generally a very 'OMG I'M A DRAMA QUEEN' sort of reply as well. Quite frankly, a post that is overreactionary in nature as well as being excessively long for the topic at hand. While I do try to be as concise as possible in my posts, in order to fully establish things, a little wordiness is quite necessary, in the name of avoiding any foreseeable misunderstanding.