We have been the first week of August each of the last three years. To give you some perspective, we have also been before SoCal blockouts in June twice, during Thanksgiving week and spring break numerous times, and other peak times such as Memorial Day, President's Day, New Year's Eve, and October weekends at Halloweentime. We have found August crowds much better than all of this except maybe Memorial Day and President's Day. So we find August crowds bearable. You're not going to walk up to rides and find 15 minute waits in the middle of the day, but you're not going to be wall-to-wall people either.
The thing about August, of course, is that it can be quite hot. We're used to hot, living in Northern CA, but with all of the extra activity of
Disneyland and all of the extra bodies and concrete around, we tend to find the heat pretty draining and find ourselves taking longer middle of the day breaks in the summer. This is ok though since we can often get so much done in the early morning and then can go back and enjoy the cooler evening temperatures and use our collected fastpasses or watch some evening shows.
And, yes, MM are Tues and Thurs. My personal philosophy about MM is to do it earliest in your trip when you're still fresh and energetic. Sometimes it can get hard for the kids to keep getting up earlier later in a trip, especially if they stayed up late the night before to see Fantasmic/fireworks/WOC.