You don't suppress your outward signs of wealth for the sake of your millionaire co-workers. You do it so that you can keep your non-millionaire friends.
You know, those fun people you hang out with and have for the last dozen years. The ones you have barbecues with on the roof of their (and until recently, your) shabby apartment building. The ones you rope into dirtbag backpacking trips, hopping chicken buses through Central America. And the ones who, through accident of fortune, now make roughly 15% of your currently inflated salary.
We say that money doesn't matter. But try buying that house you can now afford in that neighborhood with the gate and watch how it affects your friends the first time you invite them over for drinks by the pool.
I don't know what the solution for this is. But lying low seems to be a good plan until somebody comes up with a better idea.