We went last year over the MLK holiday and did not think it was that bad. We took advantage of the AM extra hours at every park and were at the gates when they opened. That was huge as we headed straight to the busiest attractions to get them done with. We also used our fast passes! The longest we ever waited in line for a ride at any park during that week was about 15 minutes! to Toy Story Mania and rode it and then got a fast pass when finished. That was huge as later in the day the fast passes were gone and the line was horrendous! A little preplanning made it all work out!
We did plan things out, like when we went to the am EMH at Hollywood studios we headed to TSM, rode it, and then got a fast pass. That was a huge help as they ran out of fast passes later and the line was horrendous!