Some people like it, some don't and it can depend on what your Dom or Domme prefers you to use. Some, for example, may require you to refer to yourself in lower case letters only which means you use this convention when you are talking about your own relationship but not anyone else (i.e. you'd refer to yourself in lower case but other subs in the normal convention). Others request that you refer to every sub in lowercase. Yet more prefer you to use proper English grammar conventions and merely be polite and respectful.

I agree that overuse of this can cause problems in reading the content of a post and so prefer not to use it myself unless I am specifically requested to do so and even then only in direct, personal communication with the Domme who has requested it.