I think you will find yourself a super taster - if you are at the top level, you will be found as a wine taster who can narrow a wine down to the exact vineyard etc. I can't do that, but am usually fairly good at figuring out everything that is in a recipe, herbs, spices etc. Like you, anything that contains aspartame is anathema to me, quite hateful. The other synthetic item that I can't abide is fake shellfish, crab, lobster etc. It doesn't taste remotely like the real counterpart to me, but I have friends who are otherwaise sane who love it. They claim they can't taste the difference, so I guess in the long run, they are lucky.
Like you I still prepare a 'proper' meal for myself most days, or eat out, and I am terribly healthy, so maybe there is something to eating well, everything in moderation and particularly, eating in season.