Oh, how I know how you feel. Sometimes, I think I need to quit reading this board because of the same reasons, but atlas, it's an addiction that I just can't beat!
I also don't want to spend ALL my time on history. MFW is very doable! and I feel like that MFW doesn't compete with other subjects, it's very balanced. I am a "scripted" "do it all for me already" "open and go" person, so I love the MFW and TM.
As for science, some say that MFW science is "light" in the earlier years, but it isn't if you truely have a CM philosophy. BUT on the flip side, if you are like me and have a more WTM bent, I actually like MFW science because it is easy to beef up the science. In MFW, Fridays are light due to doing Nature Study/Walk a la CM. Since we don't do nature walks that actually gives extra time to do science on Friday to add in a science program, because my dc enjoy science so much.
I feel like that the only way to know if TOG or MFW is going to fit your family, is that you are going to have to REALLY look at ALL aspects of the two programs, pray, and even try to get your hands on both and see for yourself. We all have "favorites" and can talk them up, but that doesn't mean it will be a good fit for you personally! KWIM??;)