Equinux (via Daring Fireball):

In our opinion, the passcode in iOS 7 has a visual security gap: when you enter your passcode, the larger buttons light up a lot longer than with iOS 6.

I don’t see it as being that much worse — they fade out instead of going off on release — but I’d recommend turning off Simple Passcode whether you have TouchID or not. You can still use a 4-character passcode if you want but it’s a lot harder to read from a distance off the full virtual keyboard. (You do have to hit “Done” at the end with the full keyboard, which is an extra tap. Sorry if that kills it for you, lazypants.)