I was going to put a sarcy comment to Allicat, but then thought, she may have explained better, what I meant, for our less experienced members.
I didn’t know that the auto boxes didn’t have syncro’s. 
(something new I learned today 
).
I learned to drive on a constant-mesh box so I had to double clutch every change. Since then, although I’ve tried, I can’t seem to get out of the habit. I have also found that the gears slip in a lot easier, if I double clutch them, especially the down-changes, in comparison to when I manage to remember not to double clutch changes. It feels like,matching engine to gearbox revs makes for a smoother change whatever I am driving, bike (esp’ BMW 
), car or truck 