I JUST subscribed to TGM a few days ago, and we'll be there the 22nd-28th. I had NO idea what we were doing, or that there was so much to planning, all I had done was our ADR's. TGM tells you which days to go, when to ride what, which direction to go, how to pack, etc. and it's catered to your desires and when you're going. We would be lost without him. Plus, you're already paying to go to WDW, might as well throw in an extra 20.
It's been really helpful so far, really.