I did once a few months ago. We were back from DMM at 6am with 4 aircraft on freq that had almost identical sounding call signs. I think we were all equally sleepy and reading back each others assignments. So I asked the DXB ATCO to change our call sign. She was good about it and it solved the problem.
Haven't used since because I didn't think it was needed, but would again if the situation arose.
Truthfully, I'm surprised that more people don't use it. I think its a good idea; however, I know that there are plenty of us on here who disagree.