Final verdict, we had a great time and so glad we went! We ran a little late, got to Mickey and Friends at 8:00, through the gates at DL by 8:30 (a bit of a wait to get into the structure, but then we walked to the parks and there was no line at the DTD security and no line to get into either park).
DL was quite nice until about lunchtime, then it got noticeably busier but not unbearably so. We stayed at DL until 2:45, hopped to DCA where we rode Soarin with a fast pass we had picked up earlier with MaxPass, then had ice cream at Clarabelle’s and left around 3:45. My friends were over in DCA for a while and said it was pretty packed! Maybe people saying goodbye to bugs land or Pixar Fest? Either way, we all had fun and don’t regret the decision to go on Labor Day one bit! Cheers!