I am in the same boat with my daughter who will be two in 2 weeks. We moved her older sister (3) into her room a month ago, because older sister had trouble with nightmares, night terrors, and sleep walking. She was terrified of going to bed and did not want to be alone. The move has been a wonderful one for big sis. Little sis loves it too, but sees bedtime as playtime. We got rid of the crib after the first day, as between nap and bedtime I put her back in 8 times. We have also gotten rid of the lullabye cd player, a lamp (both of which she kept taking off the end table and playing with- -even removed the light bulb from the lamp), and took the table out all together as she climbed on that, too. The room is baby gated and though she did climb out one time, does not usually try that. We removed or moved to a high shelf anything that was breakable.
I have tried putting her back in bed, reading in the room while she is going to sleep, calling back up to her to remind her it is bedtime, and just ignoring, hoping eventually she will settle down and get some rest. She always does, but it drives me crazy in the process! On the flip side, both girls sleep through the night, and nobody is afraid to go to bed anymore, so I still think it was the right choice for the move. The girls sometimes trade toddler beds or share one, and sometimes little sister just sleeps on the floor.
I don't really have any advice for you, I just thought you might take comfort in knowing that your son is not the only one trying this out. I know I felt better seeing the responses that you got as well as your post!
Good luck! Hopefully this will be a short-lived stage...
A.