I started on an RP server yesterday because that what my guild chose to do. I was interested in it as well to see how it pans out. I played pretty much all day yesterday and I have to say, if I didn't know I was on an RP server, I would have thought it was a regular PvE. Not one person in General chat or my guilds chat was in character. Lol.
If nothing else, do it so you won't see xxVaderzz running around.
D.