Don't know if this will make you feel better, but we just came back from 8 days in the parks. 3 of them were rated as "7" and the parks were not that bad. Granted, crowds might not have actually been at a level of 7, but we were fine. The only other time we have been was in January where EVERYTHING was walk on. I was thinking the worst. We were at MGM, Epcot, and AK on the days that were rated as 7's and it wasn't that bad. The stand by for ToT was an hour in the middle of the afternoon, but RnRC was 30 minutes. We got FP's for ToT and by the time we were finished at RnRC it was nearly time for ToT. Really not horrible at all.
What was horrible was MK on a Wednesday with a crowd level of 6!
Have a great trip!!