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Exactly.
Combined with a grille block to reduce drafts, a noticeable amount of heat is retained for at least five hours (when I commuted and used the vehicle at lunch, I'd stick my hand under the hood at quitting time and could feel warmth. This was in brutal winter conditions. And the defrost and heat came "online" noticeably faster).
When the block heater started two hours before departure (on a timer) you could see the windshield starting to defrost from the defroster vents, and the hood was all covered in snow/ice but it was all melted away at the hood to fenders and cowl gaps. I never tried to weatherstrip 'em shut.
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