Just got back from 4 full days and 2 half days at the resort. Tuesday the crowds were extremely light. Everything was walk on. Things kept getting heavier by the day, however, and by Sunday several attractions had fairly long lines. I imagine things lightened up a bit today, but by Thursday I expect it will be quite crowded. Plan your day accordingly - get their early and hit the most popular rides first, then take a break after lunch and come back in the evening. Try to plan so that you're almost always holding a fastpass. Prioritize. During the busiest times, visit the least popular attractions, or at least those with a lot of capacity (such as pirates). DCA still seemed a bit less crowded than DL, so that might be a good option at times, although the same rules apply there.