True, it can help. I, for example, like to give myself a bit of extra pressure by trying to write articles in half an hour or less, using TimeLeft. I wrote about that in How to write an article in 30 minutes or less. Some people prefer a no-frills wordprocessor such as FocusWriter (see my Review of FocusWriter).
However, I was reminded by Stephen King in his book On Writing that the routine of shutting yourself away until you’ve achieved your daily writing goal is an excellent strategy.