I used the touring plans when we first started going and can't say enough good things about them. With all the info out there, the Unoffical Guide is still the best, even if it isn't perfect. You get the most fun for your buck with the UG.
I've been to WDW a gazillion and two times, and I still use my UG.
The only problem we had, using it the first time, was that they required us to get so much done before lunch that there really wasn't much time to rest in the afternoons. So, rule out stuff you don't want to do, that's my advice.
Another big help is the section with the Best Times. If you only want to go to MGM once, in the afternoon, you can just look up and see when the best time to line for The Great Movie Ride is.
The UG and its website (pm if you want the link) are so thorough and helpful. If you pick up a copy, you won't be disappointed.
The drawback is when people get too caught up in THE PLAN. Rock n Roller Coaster konked out on us once and they were handing out FastPasses for everyone to come back. One woman was giving the employee a really hard time (like it was his fault) and finally said, "You don't understand! I have a
plan here!" Sure enough, she was holding a tear-out UG plan in her angry little hand!
If you read the book, you'll be pretty well-prepared to deal with whatever WDW throws at you.