Who would not want USA on their side? Despite all the stuff thrown up, no-one was forced to go with them into Iraq etc. And USA had the chance to occupy a big chunk of Europe, if they wanted to. Compare that to the other side, and the eastern countries are still rebuilding their countries, people, wealth etc.
The EU would if it chose to deploy, be a strong force. But especially since UK left, then EU would lose the 2 strongest members of NATO. Given the treatment of Russia over the last 30 years, by EU, I cant see any frontline country thinking it would be a good idea to rely on the EU for defense against Russia, rather than NATO. And Russia has confirmed this, not happy to see Ukr join NATO, but ok with it joining EU. What more do you need?