Saying Cogliano floats would imply that he believes his linemates can get the puck to him, which is patently false. What he, Moreau, and Stortini are actually doing on the ice is obviously an interpretive dance about turnips trying to break free of the earth's hold.
There are games where he's completely ineffective on both sides of the rink, sure, but I wouldn't call him a floater. His defensive stickwork is actually pretty good. That's why he gets a decent amount of PK time.
Kovalev used to catch my eye floating around aimlessly. It's been a while, though.
Some players are so deadly on the counter attack that you kinda want them to be opportunistic.
If my team had Gaborik, Kovalchuk or Ovechkin I surely wouldn't mind trading some defensive board work for having a constant breakout threat. Of course I would feel more comfortable if he was paired with a defensively sound centre.