I must say, I've saved for and owned outright every car before the clutter - this is the first loan/PCP I've done, but in this instance it made so much more sense.
I rent the car for buttons, I don't particularly care about it because it's a "rental' car - I just enjoy it and in 18 months time I'll either trade it or sell it depending on what I want next. No way on earth would I hand it back for nothing, the same cars at 2 years old now are fetching £2-3k more than my GFV.
PCPs these days give worst case senario, they used to offer sky high Balloons and people really got stung with negative equity. Now, if the arse falls out of the market you've got the very last option of handing it back, typically there's a few grands equity in every deal because they want you to use that as a deposit on the next car.
All the money I took out of the Golf has gone into the house, an appreciating asset and my savings are doing very well elsewhere. The "play money" in shares I don't really count on, as I could blow it tomorrow - but in general as Frodo pointed out, the high street is a mugs and pensioners game, you want return you have to accept risk.
A PCP for the next car? Who knows, some of them are still a rip off, like the deal TC mentioned on the Tiguan, but you can't dismiss the good ones. You've just got to get it into your head it's just a fixed cost to rent a car for X years and ignore what it's "worth".