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Or if I currently don't have the time to do this, I have to either stop using varnish completely or not upgrade.

I get the whole needing to drop backwards compatibility thing, but without an idiot-proof way of upgrading, you're sentencing users like me, who use Varnish as a sprinkle of magic on the server.

Some examples of before/after of actual vcl files are a must in my opinion.

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I'm late to this party, but the answer for you is to just not upgrade to Varnish 4.0 yet. Keep using 3.0.5, which is still available and still stable.

The "standard" VCL files for popular apps like Wordpress and Drupal will be updated eventually for Varnish 4.0 by the people who maintain them--which are typically not Varnish staff/volunteers, but people who work with those applications specifically.

When services like Varnish go through major upgrades like this, it is normal for there to be a lag between the main release, and the general availability of updated "recipes" or plugins.

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