I believe GCA do their part by having multiple tee boxes, but ego gets in the way for many golfers and they end up playing from the wrong set of tees.
I have to wonder if this really has anything to do with it. I admit I didn't read the thread, but there was a thread on why are there so few tee boxes in GB. So it would seem they all play from the same tees, which would put the high handicaps playing from the same tees as the low handicaps, and they don't seem to have a problem with long rounds.
If the course is such that the back tees result in lost balls or balls in hazards, I can expect wrong tees to result in long rounds.
I did an experiment recently concerning this subject, and found I take less than 15 seconds to take my practice swing and then hit the ball. So if I shoot 10 strokes higher from the back tees, I have used up an entire 2 1/2 minutes.
Inconsiderate people cause slow play. Not high handicappers or "wrong tees".
IMHO, GCAs have been doing the wrong thing with multiple tees. The only place they are needed is when hazards force their use. My entry into the Lido Competition had a single tee for all golfers.
When I was a kid, my dad and his buddy would give my brother and I their three irons and instruct us to play behind them. We took twice as many strokes, but we were the ones waiting on them and we didn't need no stinking forward tees.
I repeat, inconsiderate people cause slow play. Not high handicappers or "wrong tees".