I've tried stoking, and hated it. And the captain quickly gets fed up with all the 'watch out!' and screaming.
Nah - you just need to find the right captain
I heartily recommend the Stokerised by Wowbagger
TM experience for nervous stokers. The Thorn has a certain imponderable stateliness, and has been witnessed balancing uphill at a dizzying rather less than 2mph without falling over. And Wow is fairly tall and broad of beam - so if you're a shortarse you can't actually see where you're going and have no call to screech 'watch out'! I fairly rapidly adjusted to the staring at the scenery, and I'm a complete control freak usually.
Shut your eyes, keep pedalling and leave it up to someone else to be scared
This method can also be used for high-speed darkside descending, with varying degrees of success
tom_e, I do believe, used a variant of it i.e. 'realise that your lights aren't as powerful as the road is steep' on Blue Bank thus showing his faith in the council's highway maintenance department at very nearly 50mph