If I was in my 20's again, I would be on the first plane out of here, but I'd be under no illusion that I was somehow protected there. If the recession comes, and things slow down, E3 visa holders will be the first to go. It will have nothing to so with seniority, you will just become ineligible to work in the US. Unless you find "the one" and she happens to be American.
Have a great time, but don't burn your bridges. This too will pass.