While good grammar is priceless in the professional world, I don't think it really matters whether everything is perfect in forums and chat rooms. Often, people just want to get their thoughts across as if they were speaking, and just watch the presidential debates if you don't think smart people can screw up grammar in real time!
I went to quite a bit of school after leaving Scientlogy. I always cleared words or concepts that threw my mind off track, and I did very well in school. But, then again, I've done well in school since kindergarten. Now if I could only figure out how to get rich like all those rogues with bad grammar!
I think the study tech is useful but often misapplied or over applied. And no, I was never the guy with a can of PlayDough. Mental imagery works fine, but just like clay demos, the student must be honest with himself as to his understanding of the subject matter.