I like the simplicity and reliability of manual focus. Over 90% of my equipment is manual focus.
I do enjoy some AF systems: the 3-point Rebel G (500N) is what introduced me to AF after 50 years (1964-2014) of using manual focus exclusively. After that, the Nikon F4, Maxxum/Dynax 7, and Elan 7NE followed.
Note, however, all of the systems above have no more than 9 AF sensors, and almost always I choose to have just the center one active. To me it's crazy to see modern cameras with the whole screen filled with AF points and then a scattering 30 of them light up when you focus. Just exactly what have you focused on and how can you even see your scene anymore? No surprise that on my D700 I use just the central AF point and not the whole 51 sensor pattern.
Also, I worry that expensive AF lenses will fail after maybe 15 years. They're more complex because they have more parts, more moving parts, electronics, and electronic connections. They require more complexity from the camera body, circuitry, and display.
As William ("Learjet") Lear said: you won't have to fix or replace anything you leave out.