i.e. the long and short of this issue is, if there's a problem with someone seeing the SMTP headers on your mails, you're doing it wrong. If tormail is a honey pot, it's a much more concentrated source of suspicious data than the inconspicuous mail sent through Gmail or another typical route, and therefore those routes may in fact be much safer, because your mail is not likely to come under any scrutiny there unless you try really hard to call attention to yourself (by sending mail to the recipient listed above, for example).
With GPG/PGP encrypted messages, you will not have this problem as much.
If a person is only seeking privacy then GPG/PGP is more than enough to secure their messages (while keeping in mind the headers are visible - just alter it).
It think tormail is great for journalists etc. who need anonymity to protect themselves from dangerous times. That's about the only thing I would use it for.
I use PGP for as much mail as I can on my normal server. Even if you use PGP, it's still not a good idea to use a honeypot unless the risks at play have been carefully calculated aforehand. We want the available attack surface to be as small as possible, for lots of potential reasons: PGP mails can be encrypted incorrectly either by operator error or a bug in your crypto stack, recipients may be able to be divined from the crypted message, the government may have a secret weapon capable of decrypting certain messages, the government definitely can make an educated attempt if they determine your content is high-value, etc. etc.
Basically I think a good privacy setup shouldn't need to include anonymously-run services like tormail that are just as likely (if not more likely) to be honeypots as honestly run by a kind-hearted security enthusiast with impenetrable integrity.