I had 25 years of autos then went back to manual with no problems, other than a manual is a pain in the tonsils in queueing traffic. However, after my first prolonged driving of an auto (three weeks with an automatic Escort rental in California) I was given a shot of a 7.0L Corvette and as I approached the first set of traffic lights it would not stop. Eventually, it did, when it stalled. I had forgotten to depress the clutch! After only three weeks. It takes a lot to stall a 427 cu in V8.