I'm not so sure I like them either. Then again, I think it's maybe because they don't like me. For example, I'm a punch-in nut. I don't ever even collapse the take lanes to use them. I do everything on one track until it's right or just create another track for comps if need be.
Yet, the other night, I had this issue where this extra voice was coming in out of nowhere. I muted the tracks and it was STILL there. I happened to open up take lanes on a back up vocal track, and low and behold there was a voice there that was not being muted nor did it show up anywhere in my tracks. And...get this...it was K'd which means, muted.
So something weird happened there, but I still don't have any idea as to what it could have been. What I think happened was, V-Vocal was used and then applied, and the muted track appeared on the top instead of the bottom. When I K'd the track....it double K'd the original vocal take leaving the V-Vocal take to still be active. Whatever the case, I've never had this problem until take lanes came to be. The little I have used them, though I have found them to be cool in some ways....I've also found them to be a pain due to restrictions.
Simple fix...use multiple tracks to comp if need be this way you can make them as big as you need them to be without all the restrictions we get using take lanes. :)
-Danny