I feel like playlist-4-playlist is something that is great if you're a heavy collaborator with that person, like Vanoss with Delirious, but doing it with random people just for the exposure is wrong. If you want people to gaze upon your channel through another, perhaps you could request being added to the special section on the side of their channel where they put their collaborators and/or favorite channels after you personally work with them on a project.
Otherwise if your channel has no connection to theirs, why would anyone want to go to your channel?
I don't generally collaborate with anyone, so I just keep my favorite channels on the side and that gives them that little bit of exposure when the odd person does end up on my channel page, which is rare for a channel my size, it's honestly mostly me on there.