Alot of times may depend on who the CM is. The stupidest time we ever had to go back through the bag check line was on our fifth trip to WDW. I had taken my then 8 y/o GD down there for a GM-GD get away and had an ADR for Rainforest Cafe at AK. As we were leaving AK to go to it, for some reason I had it in my head that it was outside the bag check line, but wasn't sure. I walked up to the guy at the 'no bags' line and just stepped across next to him to ask him how to get into the RFC. He pointed off to the right and I turned to walk over there when he stopped me and told me that since I had crossed over the line that I had to go back through the bag check line. Excuse me, he saw me walk up and even spoke as I approached him (coming out of AK), my GD was still on the AK side and I was standing exactly on his imaginary line. He said that since my toes had left the park that I had to go back through the bag line in order to reenter to go to RFC. Since he had seen me coming out of AK and since I never completely crossed his imaginary line leaving the 'secured area' I thought it was really stupid to make me go out and then back in.