The first usage was January 1842 by William E. Clarke, not 1846 by W.T.G. Morton, and there was yet another one that March by Crawford W. Long for a tumor removal. Morton was of course still one of the pioneers of ether as an anaesthetic.
Wow. It's still pretty intense. I had gas (halothane?) as a 6 year old in about 1991 and they took about 10 teeth..a weird minty smell and then echoes. I woke up with a headache and a strange feeling where my teeth were.