Jeff: Some people (me included) separate paragraphs with double-linebreak. Many (most?) don’t, though.
I can’t imagine what world you’ve been living in if you only now noticed it.
Seriously, it’s strange to hear from you complaining about users. Even I, being a geek, prefer being able to do whatever I want, without first reading a “how to” on this. Especially for something as trivial as writing text.