[steve]

I haven't personally adopted the +omnifocus because when I tried to create an account on gmail, it would accept that as an address. I do however want to make the transition to +omnifocus so that when I am adding something to my inbox it is less transparent. For example, I often use this method when I am assigning a task to someone. I put my address as a bcc and "--" in the subject of the email. It is an odd practice to put -- or && in the body of the email.

If I had a steve+omnifocus@mygtdaccount set up, then I could throw emails that I send into my OmniFocus inbox without other people knowing it.

If you have already set up a special email account with the +omnifocus you can still use that as an address if you decide to have OmniFocus look for &&. However, you can't do both at the same time.