Compared to what?
If you are used to traveling during slow times, you will be in for a shock.
Before 2 years ago, I had never been to WDW during any time that wasn't the slowest times of the year (September/October, January 2-9th, early May).
We had been to WDW several times in the early part of the month (our daughter's birthday is January 5th) and just happened to pick up MLK day on one of our last trips. We got to the park early and ended up leaving by 11 am - we usually leave between 1 and 3. The park was busy (by comparison) the whole weekend and Monday. Back to what we consider normal starting on Tuesday.
elaine