I'm currently partway through refactoring all of the portable unit tests for Concise Encoding ( https://github.com/kstenerud/go-concise-encoding/tree/master... ) and it is a SLOG! I mean, so goddamn boring and tedious that I wanna stick an ice pick through my skull. There's easily another 200 hours of this terrible work ahead and I'll be right back to it the moment Dogma v1 is published in a few weeks.
Do I dread it? Yes. Am I still going to do it? Yes. Because at the end of the day I want to be able to stand back and say "I made that. I completed it - ALL of it. It's not perfect, but it's doing its job and people are using it."
I do take vacations from my projects from time to time. It's good to do so regardless, because you need the distance to gain a better perspective. Coming at it a bit cooled off means you need to refresh your memory - and that uncovers many of the UX problems your project has.