Strangely in the 33 rated OTB games I've ever played the Lucena Position has only come up once and never in any other setting. The Philidor Position has never come up.
I've played close to 400 rated OTB games. Although I have not had a textbook Philidor or Lucena, the ideas I learned studying these positions have been useful frequently, most especially in my match for the city championship against a FIDE Master rated ~500 Elo above me. In our three games, we reached a rook and pawn endgame twice. I played well enough for a draw in one, and just missed a draw in the other.
In a blitz game against an FM here at Chess.com, I did reach a textbook Philidor, played it correctly, and drew.
Silman in his endgame book (and I'm sure many other strong players) stress how important the lucena and philidor are, and though their logic makes sense (it's the goal you want to achieve for either the defense or for winning a rook ending) I simply never needed to use them.
Tricklev, I'm just as suprised as you are.