Last summer in Europe I met many hikers on “self-guided” trips. That concept is very popular there, not so much anywhere else.
Here’s how it works.
You hire a company to do all your logistics in advance: transportation, accommodation, some meals, etc.
They choose a “best” itinerary for you. No need to plan.
One example from Bredson Outdoor Adventures:
We will be offering a special one-time, 10 night/11 day, self-guided departure from July 18 – 28, 2010 that melds the best of our two existing French Pyrenees self-guided hiking itineraries with an opportunity to view two legs of the Tour de France as it passes through the Pyrenees. During this anniversary year of the Tour de France you’ll have an opportunity to see history in the making as the Tour celebrates its 100th year in the Pyrenees. This trip is rated moderate to strenuous. …
Ten nights, half board (breakfast and dinner).
Minimum two star hotels and likely one three star hotel, all with private bath; friendly, traditional accommodations in beautiful settings with very good food
Local transport and baggage shuttle included.
Price: $2,300 USD per person double occupancy. Minimum 2 people. No single rooms available. Price reductions available for more than two people.
Deposit of $500/person by the beginning of December in order to secure hotels.
This sounds ideal for someone who’s always wanted to hike the Pyrenees. AND who loves the Tour.
Check the cost, however. About $200/day plus extras. Not everything is covered in your package.
You could do a similar trip independently cheaper, … if you’ve got the gumption and language skillz.
besthike.com 
Two years ago, my parents went on a French cycling holiday. Guided, and they booked one of the more leisurely ones. Still was hard enough for my Mom, who had to push her bike up several hills. Dad’s Flickr photos and commentary are here:
http://www.flickr.com/photos/peterlong/collections/72157611221619076/
It’s good to do if you want to go to popular areas at popular times and don’t want to carry a tent – especially here in the UK where you’ll never get a place to stay unless you book everything in advance – partly because companies like these book up all the bedspaces… so unless you want to spend hours on the internet playing at amateur travel agent beforehand etc etc. Problem is it takes all the spontaneity out of it – I’ve just bought a tent 🙂