That's definitely true for me. If I'm writing a traditional web app using a language or framework I'm very familiar with then there the difference between 10% a

That's definitely true for me. If I'm writing a traditional web app using a language or framework I'm very familiar with then there the difference between 10% and 100% in cleanliness is nearly negligible. But those aren't the interesting projects. When I look at my code and it looks like shit and I've got notes and commented out blocks I feel happy because I'm working on something that my brain can't just spit out a complete answer for. It also feels even nicer to be near the end and see how nice it all looks once my thoughts have formed into a solution.