The preface states clearly that Sailing Alone is not a typical adventure book:
My own solo crossing was not an exceptional feat of seamanship. ... I'm quite proud of the voyage in terms of endurance, and my will and energy to make the whole adventure happen, but the passage across the Atlantic took longer than projected, I did not sail efficiently, and the skills that I lacked the most were exposed in embarrassing fashion. ... This book is not the story of individual excellence, nor is it a compendium of sailing records or a practical manual on how to do it if you are considering a solo voyage yourself.
King includes stories about prominent solo sailors such as Joshua Slocum, but he talks about their motivations (which he calls their why go) more than about their adventures. He describes mundane details about day-to-day life alone on a boat while eliding storms and dismastings. The overall effect is pleasantly conversational and tones down the heroic aura surrounding single-handed sailors. It's amazing how ill-prepared the early circumnavigators were!