I can't ever bring myself to type like that... even when IMing, I rarely type like that... I can't help myself, English was one of my best subjects in school, proper punctuation, grammar, etc comes almost naturally to me.
Then you got some people who outright refuse to use semicolons, as they feel it is the most pointless and needless punctuation ever invented, saying, "All a semicolon does is say you went to college." Admittedly, I see less and less of it used in writing, be it books, magazines, the paper, etc... what I DO see more of is writing like this. Just a bunch of short sentences. Like this. Lots of periods, after only a few words. I was taught that is a BIG no-no. That's like "baby writing", when you just use a bunch of really short sentences.