The greatest Google Mail feature you may not be using

The greatest Google Mail feature you may not be using:

There's a wonderfully powerful and subtle technique in Google Mail that can be used to enhance every reply you make to a mail: if you select an area of a message and then hit Reply only the selected text will be quoted in the response.
For example, here's an email I need to reply to:

If I simply hit Reply then the entire original message is quoted in the response:

But if I first select the piece that's important to me:

And then hit reply, only that part is in the response:

Use this to respond to just the right parts of a message and cut down those enormous chains of replies where the messages grow and grow and grow.

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