I had never thought about this until I saw this thread. So last night I put some Elasa QP DPR-11 on my dry hair and sat under my hood dryer for about 30 minutes. I will admit that it felt weird to put conditioner on dry hair. It was hard for me to tell if I used enough. I am so used to putting my conditioner on wet hair and then gently combing through, so I can ensure the conditioner gets distributed to all of my hair and to know if I used enough.
Anyway, I then jumped in the shower, rinsed my hair, and then put some more (just a little) conditioner on (habit I guess),
did my shower business
and then did a final rinse.
My hair felt like BUTTA! I felt like like shaking my hair and dancing like a RocStar.
My hair tends to be on the dry side and I can't remember a time my hair felt like it did last night right out of the shower. Oh and only having to go in the shower one time was like the cherry on top.
I would recommend that everyone try conditioning on dry hair at least once. It worked for me and might for you.