I know gotten is used in Australia, in New Zealand and in Canada, as well as America. Basically it is used everywhere in the English-speaking world bar the UK. It is the proper correct English. I don't understand why the UK no longer use the proper term. Yet say 'whilst' for while. Whilst sounds so primative, like doust or doest or something.
I find a lot of English terms aggravating, most of all when someone says "I am sat", or "I was sat". Same with "I was stood", "I am stood". Has the word SITTING and the word STANDING gone out of UK usage along with gotten? What is that about? I am sat doesn't look right or even sound right said out loud. It sounds like bad broken English. To be so old fashioned/Shakespearean that you use 'whilst' but then say I am stood or I am sat, often in the same post, is so absolutely contradictory, it really jars. It's like going 0-1000 from super-posh to really badly mangled English.