Until I was 30-31 y.o., I always had/drove manual transmissions. Cars, pickups, commercial vans, commercial trucks, grain trucks and motorcycles.
I liked the control, engine braking (lots of very cold winter driving), etc. a manual gave me.
Of course back then when I was younger, a very long time ago...I can't think of any MDT/HDT commercial and farm trucks that had automatics. I also liked shifting...knowing when to shift and snapping off quick shifts to keep the engine in its powerband with a heavy load. Back then tachs which are a very good aid for keeping an engine in the powerband weren't common...except on muscle cars and then usually as an option.
I started getting automatics when I was living/working in the city. All that grid lock and clutch in...clutch out...got to me.
And in these modern days I just have an automatic, but every so often I would like to still have a standard.
Now with even so many HDT's having autos I think the manual is on the endangered list.