I finally reached my breaking point with one boy this year. He constantly wants to be around me. Every time students are working on a project, he is walking around the classroom.
Today, he got the box put around his desk. The box is just electrical tape (I have found through trial and error that this this tape is the best) taped in a large rectangle around the student's desk. I give the student enough space to stand up and move around a little. The most important thing for me is that they cannot just walk up to me as they are not allowed to leave the box.
In the past I have tried this strategy and have found it to be most effective. I really hope that it works for him too!