"....spoken UK English far more colourful, varied and interesting than American English. People seem to take more joy from language in the UK.....
"My guess is that that the typical spoken British vocabulary is far more extensive."
"...my observation... is that, conversationally... British people tend to be more articulate, with their vocabulary both more precise and more diverse."

I think that, on the whole, the two nations take different kinds of joy in the language, not necessarily more joy or less joy.

I know that the two nations use different vocabularies.

I also know that British people tend to be more articulate in the way they speak, though not necessarily in the words they speak. Brits tend to enunciate their words more than most Americans do. The British speech pattern is more clipped while the American speech pattern is more drawn out or, in some states, drawled out.

As an American, I find it amusing when our British Mudcatters refer to American language, culture, etc., when there is so much cultural diversity here from state to state and even within each state. Folks, we 'Merkuns don't even understand each other here half the time!