No i haven't experienced this but i CAN tell you your employers are woefully out-of-date! Hot desking was a short-lived management fad of the mid 90's. If i had only ever read the above post, i would still know your employer was public-sector! Man i almost couldn't believe the thread title.
If you feel they may be open to reason you could show them the reasons this does not work in the long-term - the reasons you gave plus others you can find out by just googling i would have thought.
If they are not, just ride out the storm - they will do it and make a fuss of it, it won't be workable, productivity will be lost, etc etc and then it will quietly be changed back without them admitting they were ever wrong - it will be couched under "we have a new policy now" etc. 
Love
LW XX
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Right so the eagerly awaited second installment of my work's flexible working dispute odyssey.
This is bigger than the other one - http://libcom.org/forums/organise/flexible-working-dispute-time-punch-cards-10012008 - for me, cos my office doesn't have punch cards.
Up till now everyone has had their own desks, including people who work like 1 day a week.
Our managers are now merging us with another department, moving a bunch of new people into our office, and making everyone who's not an administrator - support and social workers mostly (anyone posting bollocks about social workers here, it will be deleted) - hotdesk, so they won't have their own desks anymore.
This is bad from the point of view that it will
- increase amount of work - workstations need to be found and set up every day, sometimes several times a day. This adds work and stress
- damage the working environment - people like having their own desks, it's a much nicer way to work, they can have pictures of family, etc.
- H&S will be harmed as people just won't have time to properly set up their workstations to avoid WRULDs, etc.
So basically we're going to try to make sure our working conditions aren't worsened. Will post more in a bit about what we're doing.
Anyone have any similar experiences? What did you do?