Detta,
I think you will find that many of those returned will fall into a couple of Categories and no doubt Dottie will be able to add to and also disagree to some of my views.
1. Many have returned because they could not cope with the hassle and problems of suddenly finding their dream had gone ' Belly Up ' and the Property they had purchased in good faith - suddenly turned out to be an illegal build - and as things stood at the time it would be years or even never before it would be legalised and connected to the Mains Services. Some could not cope with that and returned - whereas others have decided to stick it out and for the last 8 years have been fighting their case.
2. Some who came out under retirement age and bought properties - found themselves unable to get work when the ' Nest Egg ' they brought out with them got to very low levels.
3. Others who for one reason or another decided not to join the Spanish Health Service have found their trips back to the UK were now becoming so frequent it was more economical to return there to live.
We enjoy living out here because maybe it's because we seem to be the opposite of everything you state in your posting.
I personally as I have stated previously have no desire to return to the UK at all - we have only been back for one week in 12 years - and on our return here said ' Never Again ' - It is my intention to Die in Spain - and this next month should give me an idea as to whether that will be sooner or later - I hope later ? My Wife has already decided that when she does become a Widow she will stay here until her health start to cause problems - then she will return to live with our Son.
We never ever considered France as a choice to retire to - to my view it was not much different from the UK as regards the weather & it was just as expensive - if not more expensive to live there than the UK - We do have friends in France though who really enjoy it there - maybe them being the only English couple in their village has something to do with that

- So our choice was simple - Spain on the Weather & Economy points.
Our health Service { Spanish } is free to us - as there is a reciprocal agreement with the UK - but unlike the UK if a Doctor / Specialist decides you need a certain treatment - you get it - it is not dependant on the Post Code of the area you live.
When I came out of hospital in 2009 after a long bad ' do' it was our Spanish friends that were first on the scene to see how I was doing and if my Wife did need help - this was because being out in the wilds they were nearest - whereas the English friends did not know I was home until my Wife phoned them.
Actually what you describe ' All the Brits being together ' was the last thing we came out to Spain for - our first house was supposed to be only 1 of 8 on the outskirts of a Spanish village when we bought it { another Lying Builder } we moved out when the estate got to 150 and was still growing - every day getting more and more like Coronation Street - The English Estate is now bigger than the Village which is all wrong.
We sold and moved to a plot where we built our own house - this piece of Land was at that time 15 mins drive from the nearest property occupied by an English family and 5 mins from the nearest owned by a Spanish family.
We never felt just Tolerated by the Spanish because we were just the opposite from what you describe - we went out of our way in both places where we lived to get accepted by the Spanish of the nearest villages - and we did - we used to get in both places - hand delivered invites to all the village functions and community socials etc.
Also if you read my other postings - another opposite to your posting that we did - which I would not recommend for every one - we decided to retire to Spain in 2000 - never having been abroad for 20 years & never having been to Spain for 25 years - we got off the Ferry at Santander in May 2000 with a caravan in tow - and had no idea where we were going from there - apart from the Sth Coast of Spain - and we have never looked back since.
Maybe it's our outlook on being an Ex-pat that is wrong - I only know it has worked for us & also for many others of our friends - Who although did not come blind as we did - came with the intention of living amongst the Spanish and not in places you could call ' Little Britain with Sun ' these people seem like us contented.
The people who seem to struggle most and not able to cope well - are the ones which stay aloof from the Spanish & do not try to integrate at all - only go to English organised functions and entertainment - and are constantly moaning because the system is not like it is in England.