Thanks for the replies. My question is from an immigration standpoint rather than how busy/friendly the airport is.
If my bags are checked through it should be relatively easy, although that will mean going through security and immigration again later, but better that than festering in the terminals for hours on end.
I think the USA is the only country I know where transit passengers have to go through immigration, rather than be 'just passing through'. This time it will be an advantage for me hopefully! :-)