Am I missing something or does Bitwarden not provide available login info as dropdown in password fields? I'm seeing them only in right click context menu!

Seconding the advice provided by @cksapp.

However, my impression is that the overlay pop-up interface is not likely to be implemented in the near future, because it opens up significant security vulnerabilities (some of which are illustrated in this blog article), and adversely affects browser performance.

The keyboard shortcut (Ctrl+Shift+L) makes this a non-issue. It’s just a different way of working, which you’ll get used to if switching from a different password manager.