If I get really into a scene, I don't waste time checking my word count. XD But if I'm working through a necessary scene that I don't quite feel like writing, that's what I use to keep myself going.

The reason I do that is because I cannot skip around and write out of order - if I do that, I never go back and fill in. So I have to discipline myself to write through the stuff I'm working on when I'd rather write another scene.