On the other hand, Pete, if an opening Par 5 is not reachable (ie is not essentially a long Par 4), it is no great friend of the average golfer, from what I can tell. Neither is a closing Par 5, unless it too is a very short one. I think that '2nd/lay up' shot on most Par 5s gives more trouble to more average golfers than just about any other shot in the game. And depending on the course/site, it can lead to a double or triple bogey in a heartbeat -- definitely not the way any golfer, including average ones, wants to start or finish a round.
But this comes from someone who has rarely played a Par 5 that I've liked or thought particularly good. It's hard to design great ones, and average ones are never better than the Par 4 that might've been -- and always give a significant (and relatively greater, compared to other 'pars') advantage to the better player over the average one.
For me the less Par 5s it has the better the course; I think architects/owners use & want them mostly to chew up crappy ground and to add yardage to the card, so it can reach 6,000 and 6,500 and 7,000 from various tees.
Peter