I don't think that Phuket is representative of Thailand - I spent a few days on Buriram a couple of years ago and can happily live without the "real Thailand".
I know that Phuket is in essence a tourist colony, but it has everything that I am looking for (warmth, beaches, bars) and many parts of it are beautiful - in my eyes. I am at a comfortable stage in my life where I no longer have a bucket list of places to go or things to do.
Also, having grown up in London, I now have zero interest in big cities (shopping, temples, architecture, cultural entertainment) and so there is nothing in Bangkok to attract me apart from the airport.