You've actually seen that? Wow...you should link to an example.
While I have gone through all sorts of tactics to get my husband to pick his clothes up from the living room (and yes one of those included piling them on his side of the bed and not touching them), if the clothes make it in or near the hamper in the bedroom, or even in the back room by the basement door, I pick them up and wash them.
I agree that it would take longer - and be more annoying, I would think - to sort through mine/yours.
I will say this, though... I HATE doing whites. Since most of the white clothes are his, I'm fine leaving those for weeks at a time until HE needs to wash them. If I'm doing laundry and that's all that needs to be done, I'll do them. But I much rather avoiding that particular load! (I don't take mine out to just do those, though. If I do it, I do it all.)