Re: Worth it?
'I have an idea of how it works, I was in the army for 5 years and have taken part in a few NATO exercises and joint operations.'
Naval operations tend to be easier to make joint, as long as the ships can talk to each other it works fairly well. And the various NATO standard make that fairly straight forward.
Certainly we've had RN ships as part of US and French carrier groups regularly over the last decade or so, and there have been various multi-national task groups. An RN T42 even shot down a Silkworm missile intended for one of the US Battleships in the first Gulf War.
So yes naval multi-national operations are fairly common.