We used TGM for our November trip. I had never heard of Touring plans though so I can't campare them. I thought TGM really helped us to avoid the most crowded parks on any given day. On some days we weren't able to follow his advice exactly since I had previously made ADR's in other parks, but it did help and in some cases if we had an adr in a more crowded park, I would at least plan to spend in the morning in a less crowded park. I also thought his suggestions of order of rides to follow was helpful for when you first get into the park. I would say it is worth the money and I will most likely use him again.
His most important piece of advice, though, I think is in every guide book that I have read in the last 20 years ( and there have been many) and that is to arrive before the park opens. I think that advice maximizes your time no matter the park, the day of the week or the time of year.