I think that to some extent it depends on individual attitudes. Some people seem to like the general hubbub and activity that a busy airport brings; personally I hate it. Unfortunately, as my journeys often require connections, it means that sometimes I have to spend time in them, and on such occasions I find a lounge to be an invaluable oasis.
Just to add though, I used one of the third party lounges at Gatwick North on a Saturday afternoon around a month ago, and I noticed that pass holders were being asked to try again later.