Hahaha I had the same concerns the first time I did a GA line. The GA line queue itself is a great experience by itself. The fans that queue are great, nice and very respectful. You will feel surrounded by friends even if you don't know them. You can leave the queue for some time, but not too much. You will not have to worry for your spot if you are going to the restroom or to buy food.
I strongly recommend reading Joe Ahorro's GA Guide, it is great and very useful.