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I suspect that most of the material in this book originated on the blog, and could probably still be found on the blog with some effort. But I don't mind paying for it, for two reasons: First, it's important to pay for things that are useful to you, so that the people behind those things get recompensed and keep doing them. (If something's free, it's either a hobby rather than a business -- which means it may disappear at any time -- or that thing is not actually the product; you the customer are the product.) Second, assembling and organizing that information in a format that can be read easily offline is a major benefit.
The blog's writing is from the point of view of an enthusiastic and pretty well-versed amateur -- an eater rather than a cook or culinary expert -- and the photography is a bit better than that, with gorgeous views of things that you'll want to eat. It's probably not for top-end foodies -- there's are a few really serious cuisine opportunities in WDW, but many more "good eats" surrounding them -- but both the blog and the book are excellent resources for those of us who want to eat the best possible nosh while we're stuffing ourselves on vacation.