I sympathize with whoever criticized the guy for loud typing. Seriously, it's distracting/disruptive. I learnt to type on (manual) typewriter too but laptops and keys don't need to be stabbed with the force of a thousand suns to register the press.
It can be just as loud as people talking and (IMHO) can be harder to tune out. After all, we're used to hearing people talk all the time.
Oh and while I'm in the mood for ranting, people who eat with their mouths open--particularly when it's something crunchy--or who slurp in any way are going to be first up against the wall when the revolution comes.
I don't catch long distance trains in the US at all. I sometimes take the subway but more often than not you're just standing for 10-15 minutes. In Germany, I don't recall having a lot of problems with noise (although, on one train back from Oberhausen, the smoke was so thick you couldn't see one window from the other in a very Cheech and Chong moment). England varied but was generally fine.
What I'm not looking forward to is when cellphones become usable on planes because you know someone is going to sit there and talk loudly for the entire flight.
One tip though: my Bose noise cancelling headphones are worth their weight in gold.