This is my experience as well. One hits the max dosage and eventually moves back down. I rarely use any Intestinal forumulas anymore - perhaps after a 'big bad' meal :)
And, again, I don't see herbal laxatives as a bad 'addiction'. I'd much rather be going every day taking a plant based pill. Its not like we say someone who needs to eat 7-10 servings of fruit and veges every day is 'addicted'.