There's a few of us on the forum who have tried the Vitamin E enema and seen some benefit from it. Sheldon (whose post you linked to) has also replied to a few threads on this forum in the past.
I haven't found it to be as effective as it has been for Sheldon, but find it useful to do occasionally, along with my other therapies.
Rio, 33 year old male. Diagnosed with UC in 2006
Azathioprine (stopped), 4800 mg Asacol
Vitamin E enema or Canasa/Mesacol suppository occasionally