It can be addictive. My wife will testify that I went through a minor personality change. Now I grant you that few people take a half dozen classes at once. But, I was near a keyboard about 18 hours a day. If anyone says that you work less with an on-line class, bring them to our house for a fight.
People take on virtual personalities.
For the most part, I was myself. But, in one course, where the instructor was going at a rate of a snail, I decided to become an expert in bird watching and all of my questions were about bird watching. Now, I know nothing about it. But, it was an amusing process to watch how easy and tempting it was to take on virtual personalities. Trees gave their lives for my classes.