In my shul we have always had a mechitza b’peh, a separation made by words of mouth, which is learned from the Halachos off Teruma. It is very effective at keeping men and women separate because it is understood that if you don’t abide by the mechitza b’peh you are undermining the separation of Terumah, and no G-d fearing person would want to eat tevel. It also has the fringe benefit of ensuring that no kiddush clubs are formed because all the women would see clearly who left and that is an effective deterrent.
This old minhag has come under some attack recently by the more modern folks who insist on having a mechitza b’kli, a separation using a wall. They are not afraid to degrade the mechitza b’peh because they don’t worry about hilchos terumah- everything they eat is either grown in chu”l or is grown with some concocted heter mechirah (why they don’t require a heter mechirah b’kli is beyond me). I see that this newfangled shtus is getting some support here, no one even mentioned the original preferable mechitza. Is there no one who will stand against this?