My vote goes to a combination of both, serviced trekking. You get the remote locations, the break from civilisation, but someone/thing else lugs the crap and makes the dinner. Unlike Ben B I've mastered the art of washing in a tent :) so I don't miss a shower. And it gives you the opportunity to spend several weeks away from the worst aspects of civilisation, something that just wouldn't be practical if you had to carry all your own supplies.
Nothing wrong with cars and proper campsites though, especially in the UK. It means you can have decent, non-dried food and changes of clothes and an easy bail out if the weather turns really bad. So it allows you to concentrate on climbing, or whatever it is that you're there to do.
Having tried low-tech wild camping (Ray Mears style) it's not something I'm keen to repeat: it just takes all day to catch your food and gather your fuel. When I do camp out, I've no hesitation in taking the dried food and the ultralight gear - simplicity's one thing but hair-shirtism's quite another.
