April 1 to 6 is during week leading up to Easter. Three most crowded weeks of year are that one, the one beginning with Easter, and Christmas week (other spring break weeks are significantly less). The question is what are you used to? Weather should be ideal but crowds will be huge. If you generally go during off-season and feel that is overly crowded, you should probably avoid Easter time. If you have been during the crowded summer months (other than week July 4 is in which comes close to Easter), those summer huge crowds are less than what you are going to see during that week in April. Extra hours help, going early also, fastpass is a must (and for popular rides run out by noon), most crowded time of day is 10:30 to 3; some secondary attractions which are very crowded in morning can be fairly easy after 3:30, park hours are late, ressies for dinner are a must, the second nightly Fantasmic is easy to get into, people start grabbing ideal spots for daily parade up to 2 hours beforehand, non-fast pass lines for popular rides can get to over 2 hours (for most of day) and some close to 3.