I think it's really overkill. The actual conjugations are rarely the issue for me. It was well explained before you added all this, and I would have loved to have seen more development and exercises that actually focused on WHEN to use the subjunctive, as that is why I return to these lessons for review.
I wouldn't mention it at all, but this is the forum for feedback, and I've noticed the same trend when I go back to review other Language & Culture lessons. The grammar lessons themselves are great, and I need to review them frequently at this point, but the additional exercises are almost exclusively these conjugation drills, and are really not very helpful.
Just my 2 cents.