I used to just write code fast and forget about it, only slightly caring about the finished product. After having to build and support 2 fairly large applications(for use on a company intranet) I will fully plan, document and test my software. No more clever code, no more quick hacks. I also gave up on Javascript and node.js, and I mostly do c# now because of type safety.
Caveat: sometimes you just want to finish something. Specially when prototyping or creating an MVP, it's important to have a hard focus on the end goal.
