That might depend on your airline.

Have only flown out of the 'new' terminal twice on Saturday mornings and both were jammed (US Air has weekend sales to the Caribbean and the lines through security were horrendous - US Air uses two of the three concourses and the weekend fares attract many families, vacation folks). The clubs are after security which helps if you've allotted more time than needed.

Have also flown out of the 'old' terminal several times (NW) on weekend mornings and never had bad lines - although the club is before security so you may still end up with waiting time at the gate.

Both terminals were also dedicated shoe carnival sites when I've gone through lately - which adds to the general confusion and time delays.