Burnt out, I love you man! You are validating my methodology (which I was afraid to put out there). I stopped testing for almost everything about 7 years ago. PH is on a meter, temp is on a meter, alk and calcium get tested about once a month. I tested for magnesium a bunch of times last year but it never changed. I do water changes and drip Kalk for the makeup. I tested for Ammonia, Nitrite and Nitrate for about 8 years without ever getting a measurable reading. I would get some phosphate readings from time to time and get concurrent algae growth. Now when algae starts to grow, I just change the resin without ever even testing for phosphate.
I tell all of my friends that this is the easiest hobby that I ever had. They never believe me!