In the past I sort of did it 50/50 for fish; never for coral.
Now that I am moving most everything to the new tank everything will be dipped and briefly quarantined.
I will be relying more than ever before on the dips and I also got a new UV sterilizer for the QT tank.
I won't be adding many new fish. A couple of pairs of jaw fish which usually respond well to dipping. Maybe a pair of gobies. That's it.
And I never keep tangs.
It's not just because of the ich. I feel that tangs tend to be real bothersome to other fish and I just don't like that. Happy, relaxed fish are healthy fish IMO. Tangs don't just introduce parasites, they also introduce stress in a lot of cases.

I didn't vote because I don't meet the 3 week QT criteria but I also won't go with totally skipping it.