Last year, I discovered a magical way to solve this whole issue and it has been wonderful. OK, it isn't really magic, but it sure feels like it, because it has completely changed how my classroom manages themselves, allowing me to help students in peace.
What is a Teacher Waiting Room
Let me introduce you to the Teacher Waiting Room. I know, it sounds super official doesn't it? It is truly as great as it sounds. I created a set of tags. Last year I used clothespins and a bin with my tags. This year I stuck magnets on the back and have them on the whiteboard. Both work just about as well as the other.
How to Use a Teacher Waiting Room
Using a teacher waiting room is simple. Instead of allowing your students to form a line for help, you will have them take the first available number instead. Students will then return to their seats and work on something else that they do not need help with until it is their turn. Students will work quietly, allowing you to quickly help other students.
When I am ready to call a student for help, I simply call out their numbers in order, one at a time. Once their number is called, they will return their number, then they will come to see me for help. I will continue calling numbers as needed.