His style is informal, his book is fun to read and can be read quickly, but it will soon be forgotten. When his writing becomes awkward, the information isn't very valuable anyway. In contrast, McConnell's book will be remembered for a long time. He is an experienced wordsmith and develops his ideas with clarity and purpose. Even though it is easy to read, I found myself reading it slowly.
Every paragraph has something to offer the reader.
Soon everyone will see the advantage of using the techniques McConnell promotes. The way software is developed is changing, and this book is moving that trend forward. Results like that will get anyone's attention. To stay competitive, many more companies will adopt these methods. They are not difficult, they are not magic, there is no trick to it.