From How to Write a Lot by Paul J. Silvia:

Research is oddly fun. Talking about ideas and finding ways to test your ideas is intellectually gratifying. Data collection is enjoyable, too, especially when other people do it for you. Even data analysis is fun – it’s exciting to see if a study worked. But writing about research isn’t fun: Writing is frustrating, complicated, and un-fun. “If you find that writing is hard,” wrote William Zinsser (2001), “it’s because it is hard.” To write a journal article, you need to cram complex scientific ideas, methodological details, and statistical analyses into a tight manuscript. It isn’t easy, especially when you know that anonymous reviewers will thrash that manuscript like a dusty carpet.