Welcome to CC.
Yes, the Lounge is the busiest room, followed by the Bible Study room. After that it's kind of hit or miss if you will find others in the rooms. The later night slot tends to be busier in the Singles room.
As far as active mens groups, most Christian sites i've seen do not have active mens groups. There are plenty of men, but they just are not coming together. I think because most married men are less prone to be in forums/chats and the single men don't want to be away from the ladies.