There is a difference in how they are preaching. I have found many people that do it, however it's not like the JWs. They talk about using their different strengths.
For instance, someone really shy, door to door wouldn't be their strength, so why do it? Their strength may be in studying with those who are interested instead of talking to strangers. Etc.
I have talked to many christian apologists and I hear them say that a lot. I don't make videos that's not my calling, I am more suited to answering questions. etc.
The thing is, there is a lot of preaching going on as it turns out. More than I ever thought as a JW. What is even more interesting is those who are preaching the most, are not preaching about a church, or an organization, etc, they aren't trying to get you to "join" anything. It is truly a message of God and Jesus, not men.
I just found that very interesting myself.