The only thing that really matters is your viral load. They are now even considering once you reach undetectable to only test cd4 once a year or even less (if needed).
My Doc said that he has most of his long term UD patients on the once-a-year CD check (including me) for the very reasons you mentioned. I checked with his nurse to see if his two other ID doctors in the practice were doing the same and they are. I miss the bi-annual results only for curiosity sake - what I'm most interested in is that it comes back UD.