I was a part-time CM at a local
Disney Store when I joined DVC. (This is when Disney still owned the TDS), and everyone at the store where Disney-addicts, but I was only the 2nd person at the store who had joined DVC. Everyone else at the store who went (often multiple times a year) preferred to go on their discount. I did have 2 people give me grief about joining, and one even gave me the "You fell into THAT trap? Hahahaha!" - Of course this is the same person who has been going to WDW for YEARS (long before becoming a CM), and only stays at the YC. I can't imagine how many points she could have had if she had bought into DVC, of course now that her son works for DVC she at least "gets it" (although still hasn't bought in).
At my job that paid for my Disney-addiction, my boss and immediate co-workers either get it, or at least know it's just me and lets it go with only positive comments and mild curiosity. (I planned my bosses trip a couple years ago, and she's still trying to figure out how to go again.) The other people at work just kind of laugh. They see my passion for Disney and just think it's cool. They also like having someone to go to whenever they start to think about a Disney trip. (Plus I'm a computer tech... they know to keep me happy.

) I do admit I don't talk about it as much as I use to. I only bring it up if asked, and try to judge my conversation by the look on their faces.
Outside of work, my friends know of my Disney obsession and just go with it. I honestly think they would faint if I told them I went on vacation somewhere other then Disney. Oh and the really fun part... My Primary Care Physician is a DVC member, and my Dentist is a Disney addict too (although I haven't convinced him to join DVC - yet).
My Mom and Dad (divorced w/ their own separate families) have been going to Disney every year for years (not together), of course they started AFTER I moved out of the house

. So telling them was a non-issue.
MY DP's work gives him the "Again" thing, but he just eats it up, and bombards their cell phones w/ Pix msg's while we are on vacation. His family is really supportive too, we took them to Disney soon after we bought into DVC, and they know we are planning another big family trip as soon as the nephews get old enough.