>>65766188insurance stuff aside, the most important reason to go to the doctor frequently is so that you can maintain an overall baseline of what your "normal" health condition looks like, this ranges from standard blood tests to vision, dental, heart, etc
making this kind of baseline seems like a massive pain since you "have to go to the doctor" every 6 months or a year, but 10 years from now when you have an actual real problem, you have an indepth history of what your body normally is doing and its a lot easier to see if you have had any degenerative issues going on across your entire system compared to just attempting to diagnose what is going on with you in a vacuum