I think it's fleshing out the details of stories. So many times, I'll have a vague idea about a story, but I don't really know the details. It's a lot of fun to see a story come together and come to life, but it can also be frustrating when I can't see everything all at once.
I do read my reviews. I still get a warm fuzzy feeling when I read a good one. I can deal with bad ones, because I realize I won't please everyone. Besides, my day job is working in customer service. I've heard WAY worse from people I've talked to at work.
All. The. Time. When I get writer's block, I'll go back and read previous parts of the story to get myself back into the zone. If that doesn't work, I'll try writing scenes that I know will come later in the book (they can always be tweaked later as needed based on how the story shapes up). Sometimes I'll just set the whole project aside for a bit and work on something else. Or I'll read a book for inspiration. And, honestly, sometimes the very best thing you can possibly do is just to rest for a bit. Watch a movie or play a game of Scrabble with someone or do something that doesn't involve writing.
Oh, that's easy. Book pirating. Stealing an author's blood, sweat, tears, time, effort, and energy is disrespectful and unethical. And, no, it's not good for authors because it gives them exposure. Because it kills our sales, and this is our livelihood that we've put effort and money into before you even buy it.