Disconnecting VCRs/computers/etc can be equally bad, as it causes a surge of power when plugged back in. Of all the things that have harmed my AG-1980 decks over the years, loss of power was the biggest one. Not lightning strikes, power fluctuations, etc, as I use a UPS.
Same for computers. The worst damage has always come during power on, as it creates a surge. That's actually a very credible reason for why to leave on a computer 24/7/365, though heat creation/output need be a concern for that scenario.
Everybody that values electronics should use a UPS.
UPS are cheap compared to the TV/computer/etc being protected, about $75 (decent) to $150 (best).
My advice = Only unplug video gear when it will not be used for a month or longer.