I use my Amex benefit to go in there a lot. Crew members generally stick out like a sore thumb. Uniform with hastily thrown on pullover, Luggageworks bag with hat stuffed in the handle, and hoarding plates of food and cookies "to go".
I had the greeter actually thank me for changing shirts (wore a polo) one day since he saw my luggage and knew i was Crew.
You want to go incognito in a lounge? Buy new luggage and completely change your outfit. Get a Bluetooth headset and make some calls, yelling so that you are sure everyone in there knows how important you are. Otherwise, just lay low in the corner like the rest of us.