It was actually not that crowded. We were there the 10th-12th.
On friday, we got to Disneyland around 9:45. We went on Buzz 2x (10 min wait), Pirates (walk on), Haunted Mansion (10 minute wait) and splash (walk on) by about 11AM. We were able to eat at carnation cafe at 12:15 with no ADR.
We went to DCA at about 1:30PM. We did have a 40 minute wait for TSM. We went on GRR 2x (walk on both times)
We went back to DLH around 3:00 and went back to Disneyland at about 5:45.
We had dinner at pizza port and went on buzz and BTM. We found a seat on the curb for teh fireworks at about 8:15. It was still empty around the hub at that time. It didn't start filling up until between 8:45 and 9:00. Even when the fireworks started there was still room to move and space between people.
We went from the fireworks to Fantasmic and for the 10:30 fantasmic show, we were able to find a place to sit close to the middle at about 10PM. Even when fantasmic started, there were still places left to sit.
On saturday, we didn't get to DCA until about 10:15.
We went on soarin 2 x (walk on both times), TSM (35 min. wait) and saw Aladdin at 12:10PM.
We went to Disneyland after lunch around 2 PM. We went to Pirates Lair and than went to main street to get a seat for the parade. We were still able to sit on the curb at about 3:10 for the 3:30 parade.
After the parade we went on snow white (5 minute wait), pinnochio (10 min wait), and peter pan (20 minute wait).
We went to Cafe Orleans for dinner around 5:30 PM (no ADR and no wait). After dinner we left to drive home.
Overall, the longest wait we saw the entire time was 60 mins on friday for space mtn.
On saturday, the longest wait we saw was 45 minutes for TSM. We didn't see any waits over 40 minutes in Disneyland.
World of Color was insane but I don't think the overall attendance to the parks was impacted. I just think that it meant the fireworks and fanatsmic were much much less crowded