RJ - yes it is all about opinions, but just making things up and repeating them doesn't make it true.
You all also said:
It stands to reason that if an aircraft landing has to turn 180 degrees and then backtrack down the runway that departures are going to progressively back up whilst waiting for a free runway.
No it doesn't - this would only hold true if the runway was running near/at capacity so there was a constant stream of a/c waiting to arrive and depart. I would expect that the airport and airlines factor this into their schedules so that it isn't a problem. If it was, the airlines would be making a noise about ("We would love to fly to X, Y, Z, but...").