why?

they are a fantastic way to project power without having land bases, obviously. We have used them quite a lot for this purpose in the 60 years since cruise missiles were developed - including in the wars we are currently fighting.

also they are major sources of money for industry in important congressional districts, and have symbolic power that politicians and leaders crave.

no one else does it because they are expensive, difficult to develop, and no one else has the need to support global operations like we do (though China is getting there, and the UK fondly remembers when it used to).