WELCOME!!
As the PP's said, it depends on your intended length of stay at DTD...if you're planning on the parks first, and then staying in DTD, definitely use the parking garage. If just DTD, then use the DTD lot. If you are coming in from Ball Rd or the 5 - watch the signs above, as there is a lane specifically for the hotels and DTD. If you accidentally are in the Theme Parks only line, and don't mean to be but can't get out - just go to the toll booth, and tell them so, and they'll let you out without paying, and it will actually then exit right out near the DTD lot's entrance.