How I dread logging the hours there! Especially if it's a day or two after the fact. The items will often be specific features to be developed. And so I sit there, with the time sheet (and 20/20 hindsight, of course) asking myself: "How could you possibly have spent that long finishing it? It had a low estimate! Better round down so they don't think I'm an idiot. Who in their right mind would pay someone XYZ to add a lowly checkbox in the corner? I wonder how many hours Bob logged for that radio button he worked on. Those guys outside have emptied half a street's garbage cans in the time it took me to look up this API."
Of course, it's probably mostly in one's head. Like the author I don't really get negative remarks on performance, and consider myself a reasonably decent developer. But even so, the task of painstakingly journaling every half hour worked seems incredibly demotivating sometimes, for presumably no other reason than being a great time to second-guess everything you did.