I have PP through my Amex card, so although I don't pay directly for it the cost is certainly there in the steep annual fee to Amex! Either way though I don't think you would regret joining based upon the itinerary you mention.
If you are going to be spending 5 - 6 hours laying over in airports you will certainly appreciate the ability to get out of noisy and crowded public areas. And as you are clearly a person who appreciates a self-service bar (who doesn't?) you will almost certainly find that the Pass pays for itself.
I once got stuck with a colleague at CDG for fourteen hours due to severe weather. There was nothing for it but to repair to the lounge and empty all the Vodka bottles. I think we consumed my annual fee on that day alone.