I'm probably the last person in the world to have noticed this, but Steven Moffat works a heck of a lot of creepy terror in Doctor Who through repeated, creepy, sometimes low-affect sentences: "Are you my Mummy?" "Hey, who turned out the lights?" "Don't blink." "Donna Noble has left the Library. Donna Noble has been saved." "Do not be alarmed. This is a kindness."
Utter, repeat, creepify.
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His creepy episodes are among his best. He doesn't seem to do as well with stuff like the Pond finale. That one has so many plot holes you could strain pasta with it.
Yeah … I'm not 100% convinced that Moffat is best as overall showrunner. Some of his one-off eps have been the high points of the modern incarnation of the series, but his overall vision has sometimes been way to complicated for its own good.