Nice contradiction there - first you say you have "not" had the survey, then go on to say you DID have one - in the very next sentence! Are you sure?
no. They are random and totally automated. I've had a bunch so far this year. Probably every 4th or 5th flight at a guess. While I ignore them personally, I'd hardly say they are "dreaded" - while I do wonder how much impact these surveys have - as I imagine any results are summarised into average statistics regarding "customer satisfaction" - I do think they are a standard tool in the industry. I imagine the take up rate is pretty small though.
Some say that the airlines never "listen" to the customers - well these surveys are one way in which they do solicit feedback.
It is amusing that
@Pushka received one - but I'm going to go with amusing coincidence.