How do I unlock my Mac without having to click my name?

Solution 1:

Just by typing the first letters of the user's name should select that user. Afterwards, as you say, pressing Enter will prompt for the password.

Solution 2:

Also you can use the Arrow Keys ← or → to select the user name you want and then press Enter to get the password prompt.

Solution 3:

Actually, Cmd + L still works too, but my problem seems to be that the keyboard is unresponsive after locking if the screensaver kicks in. For now, I'll up the time for the screensaver to kick in as per How can I set the Mac OS X screensaver when not logged in? and hope that Apple fixes this in a future update.