Yeah, I know what ya mean. For decades I was happy with MF Tamron Adaptall SP lenses - the 90, 180, 300, 80-200 were fine tools. Then I found out eyes don't stay young forever and a nerve injury bagged my focus-hand.
I've since transitioned to AF equivalent lenses and learned it's not that the pig can whistle "
The Bridge Over the River Kwai" in perfect beat and pitch that counts, but that he manages to whistle at all that's amazing.
Auto-focus -- gotta trust but verify. An' that certainly does slow things down to MF speed doesn't it.