I never DT anymore, ever, because it always leaves me overconditioned. The only thing that approximates DT for me is when I am at the beach, when I slather my hair with oil before I go out in the sun. It comes out pretty fluffy then, too.
It was about a year after I started CG that I started noticing that each and every time I used heat or even a plastic cap my hair came out uncontrollably fluffy and overconditioned. Before that I DT'd once a week, and did an oil treatment once a week. No more, though.