We've been twice during Columbus Day weekend - in 2009 and this year. I thought this year the crowds were lighter, but as others have said, it rained Friday afternoon, all of Saturday, Sunday morning, and Monday started overcast, although by 9:00 am, the sun came out. The rain on Saturday and Sunday morning was not a light rain. It was a heavy downpour, non-stop, sometimes windy rain. We wereat DHS on Saturday for EMH, and it was not bad. We rode TSM standby first thing in the morning, and I think we only waited like 20-25 minutes. Not many were braving the ridiculous rain. We did TOT standby and it was only 10 minutes. I think many were discouraged by the outside line. Sunday we were at Epcot and it was pouring once again. The Land had a 20 minute wait, the busiest I've seen, as folks were waiting for Soarin' FP windows to open, instead of going somewhere else. Once the rain cleared in the afternoon, Test Track got very busy, over 60 minute wait. It had been closed during the rain.
I thought overall Columbus Day weekend was doable with a good plan in place. It's a holiday, some are out of school (my kids got 2 days off school), but it's not like Christmas, Easter, or Thanksgiving.