www.tourguidemike.com
It is basically an on-line guidebook that is updated for changes in real-time ... different hours for holidays, changes to EMHs. He also makes recommendations for which days to visit each park if you are a on-site guest or off-site guest.
He has touring plans that are aimed to have you avoid the lines - his theory is zig when others zag. I've used his recommended itinerary for preschoolers and swear by it!
I am probably a lifetime tourguidemike subscriber - for me, its worth the $20 to avoid a meltdown of children. (I've also stopped buying hard copy guides and use his exclusively). We also tend to travel during February hours which fluctuate so I can get the best information from him.
There will be a variety of opinions about Mike - search on tour guide mike or tourguidemike and you can find the advice. Few people are ambivalent - most of us either love his site and find it helpful or hate his site and find it cumbersome.
Good luck!