When writing code, I'm most interesting in figuring out how to do something. Once I've figured out the technical details, I tend to get pretty lazy about the polish - bits to make things user-friendly, generally. I have been contrasting this with a coworker who is very concerned with completely polishing his assignments for this course.
Similarly, I tend to leave art projects unfinished, once I've got the basic idea across.
The final finishing stages get aren't as exciting for me.