We've encountered the portable parking lot a few times on I 4 in Orlando.....it's all about timing...our worst occasions have been 7 am - 7 pm.......
Last trip in Mayer were going to pick up the 417 in Sanford, pay the tolls to skip the I 4 snarl......but we approached Orlando around 3-4 am and we're just about all by ourselves driving the I 4.....scary being all alone... We cruised the whole way right into WDW, and plan on doing it again next trip...
We left northeast Ohio, driving down I 77 to I 26, to I 95 and planned on stopping around the Ga/Fla border ( about 12 hours to there) but said it was around 10 pm, let's make the Florida Welcome Center and snooze a few hours there and get into WDW real early..... saving the expense of a motel for those few hours....worked out perfectly...
We were excited to get to WDW and start playing as soon as possible, checked in at 6 am (no room but everything was set up) went to Public for our supplies, got back to POFQ for food court opening, made EPCOT rope drop with time to spare, saw the last day of the Flower show and was beeped that our room was ready by noon.....it was like getting an extra free day in WDW than arriving at 1 pm or later....
We leisurely unpacked, loaded the fridge, packed a cooler and headed to the pool by 1......refreshed, posted to DTD, a little shopping and back to resort for some MK..... beautiful way to start the vacation.....
Sorry for rambling.