I have an extension cord as well (if you aren't exaggerating, and your room is not super-small, it's not as long as yours), but... I don't know. It feels too jerky to me.
Oh, one of the main reasons I prefer wireless to cords is, other than the possibility of accidental unplugging, I'm quite lazy and don't like having to wrap cords around controllers (Which, on top of taking precious seconds, I've heard is not good for the controller in the long run... is there a better way?) and would rather just switch the WaveBird off and putting it someplace on my desk. My opinions may be stupid, but hey, I'm a pretty stupid guy.