>> The only real defense is to glance at the url bar every time you're about to enter your password
With Google specifically, the worst part is you really do have to look at the URL every single time you go to enter your password. And by that I mean that if you land on the login page, verify the URL, enter your password, submit, and get the error page saying you got the password wrong... you must check the URL again before re-entering your password.
Why? Because Google's login, by design - and repeatedly defended by them as being "acceptable" - allows redirecting off Google's properties after login. So hackers send you to the real Google login page, with a post-login redirect to a fake but perfect copy of the "wrong password, try again" page, where they then capture the passwords of people who mindlessly re-enter their password without double checking the URL a second time.
Most importantly, 2FA does not help you here. You'll enter a currently valid 2FA code on the hacker's site, and they will immediately use that code to actually log in to your account. Before you realize what is happening, you are already locked out of your account - new password, 2FA stripped or replaced, security questions changed, and all pre-existing sessions/devices wiped.