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HTTP referrer header will be stripped from HTTPS to HTTP according to RFC so it solves one of the problems.

Also there is a Chrome extension for Google SSL Web search: https://chrome.google.com/extensions/detail/lcncmkcnkcdbbanb...

I don't think it blocks the header for HTTPS -> HTTPS traffic though.

That's a good point :) It doesn't

Encryption would just make sure that only Google gets your search queries. They would still profile your searches. Also, opting out of Google Analytics does not affect your search profile.

But then, why should we have to opt out of this instead of opting in?

Here's how Google SSL differs from default Google: http://www.google.com/support/websearch/bin/answer.py?answer...

... which confirms that Google SSL protects my privacy as much as DDG, right?

It's good, but it's not that good :-) DDG doesn't even log your IPs.

https://duckduckgo.com/privacy.html

Only if you turn off your Google account's Web History.

How would that solve the problems listed in the original link?