No. I hate the whole balloon release thing. Just send up plastic pollution into the air, and not care where it lands? No.
And don't get me started on those stupid burning lanterns. One landed on a church near me last year, and burned the church down.
Only as a kid, back before it was widely recognized that balloon releases are extremely hazardous to wildlife. I would never participate in one now, and I haven't hesitated to tell people considering one how dangerous they are for the environment.
No, but I did do a couple messages in a bottle with zero replies.
I remember doing this at school in 2nd or 3rd grade (mid '80s). I never got a response and was so jealous of the kids who did. One boy got a letter from a town about 100 miles away!