NEVER in EVER ADD INTSNCE DUNGEON ON A PATCH DAY.
Uhh, when else do you propose they should be added, exactly?

If it bothers you that much just pretend the "patch day" is a few days later than it actually is. Bam, no more congestion.

It's like going to the theaters. Go there on the first day a new hit movie comes out, you're gonna have to deal with long lines. That's just the way it is.

They've done it before, had tons of complaints, and they did it again.

Don't you see--they know you're gonna play it anyway, regardless of your complaining about it. It angers us all, but if they keep doing it, it's obvious they don't care.
There's a difference between not caring about an issue and there only being so much they can do about an issue.