We go this time every year (late April into early May). This year it's April 29 to May 11. This will be our 13th year in a row for us. The crowds during this timeframe are moderate. Not crazy like summer or holidays, but not slow like parts of January and September (before free dining). Weekends will be very heavy and crowded and expect some school groups (usually a good time for Music Days, the kids usually stay at the value resorts, but never a problem). There will be a convention or too. I think the reason that last spring was completely out of control was because Easter was so late in April (20th), which kept most of us who like to avoid the week before and week after from booking. This caused most of us to try to squeeze our trips in from April 28th and try to avoid Memorial Day weekend--yikes--. This year Easter is earlier, April 8th, so the week after should be the end to some of the crowds and then regular rate season should begin on the 15th, giving us an extra couple of weeks to get our trips in. This is a popular time for the locals too, especially before AP seasonal passes get blacked out for the summer. No one should go during this timeframe and think it will be slow, because it will not....actually there is hardly any slow time to go to WDW anymore. There are days where the parks might be less crowded, then the next day they will be unmanageable.