Yes. I like the HTML formatting; it makes for more effective communication. You can use bulleted paragraphs; bold, italic, typewriter font.
In a HTML message, you can have an indented code block which is not physically indented. When it is copied and pasted, it has no indent.
Hyperlinks and images can be used in HTML messages, which is convenient.
Color is possible: syntax colored code can be incorporated into an HTML e-mail.
Also, I use an mailing list archiver called Lurker, which I customized such that it allows HTML messages to be incorporated into the archive. So poor archiving of HTML mails isn't any objection.
In a HTML message, you can have an indented code block which is not physically indented. When it is copied and pasted, it has no indent.
Hyperlinks and images can be used in HTML messages, which is convenient.
Color is possible: syntax colored code can be incorporated into an HTML e-mail.
Also, I use an mailing list archiver called Lurker, which I customized such that it allows HTML messages to be incorporated into the archive. So poor archiving of HTML mails isn't any objection.