I have done a lot of spinning as a flight test observer, I can't say I've always enjoyed it but it is a beneficial exercise.
When I turned 400hrs in other stuff into a light aircraft PPL early this year the CAA insisted I did 2 hrs stall and spin awareness (11 hours of spinning and more stalling than I can count in the logbook didn't matter apparently) - I told the school that whatever they had planned we were going to do 2 hours spinning.
IMO every pilot in training should see a spin and execute a recovery - if only to stop them playing silly buggers near the stall. On the other hand, too many PPLs don't regularly practice stalls anyway, and we shouldn't be frightening them off doing this.
At the point of stall incidentally, many aircraft don't have the control authority to enter a spin - it's large control inputs at about Vs+5kn that are more likely to end in tears.
I think WW makes a valid point about type conversions. Surely anybody converting to a new type should have read the POH and all it's handling advice first, if they haven't surely an instructor is being unprofessional in flying them and signing them off. Next think you know people will be flying aircraft without checking the technical logs.
G