"...do any other producers maintain this level of dialogue with their viewers?"
None that I'm aware of. Some maintain a presence on-line on an occasional basis, or on one or two services, or have someone filter their messages...but none at this level that I can name.
"But there must come a point when you turn away from the keyboard and laugh "it's just a tv show"."
It is...? Good heavens...then what's that Vorlon doing in the living room...?