If you're a writer, you know that getting a new idea is wonderful. You also know that getting a strong new idea is beyond wonderful. First off, it means you're going to be passionate, really passionate about the project. Passion leads to satisfaction. It can also lead to dollar signs if it becomes contagious on the page.
Needless to say, I've got a strong new idea. The strongest in years. I can't wait to get to work. Even more telling, I can't wait to get this done and out there. Hemingway said it best when he pointed out that writers are always more passionate about the next thing they're going to write rather than what they're penning at the moment.
Which is why it's important for writers to be productive, less they become wannabe writers. There's countless people out there who have great ideas they half-intend to someday put down on paper. Real writers write. Real writers finish what they start. They take a new idea and see it through until it's a finished product.
Therein lies the difference.