Well, getting back to the subject
I use lounges all the time.
When flying from BHX I use the dreadful Servisair lounges or the passible BA lounges depending on what class of travel I am in. For BHX and Malaga I do use Priority pass, as has been said before, a lounge is a haven from the noise and bustle of the main airport terminal and you can get a seat!
When flying from Gatwick with Virgin I use the truly wonderful Virgin lounge, a lounge like no other airlines there.
You can have a massage, a haircut, and for the girls, nail work, large breakfasts and other hot food, free internet access, free newspapers (yes, you CAN take them away!) tv lounge, cinema and games room and even a shoe shine guy.
They have started a lounge for non Upper Class and gold card passengers at Gatwick called the V-Room and that seems to be getting good reviews as well.
Out of Heathrow, either the (again) wonderful Virgin Clubhouse or the BA terrace lounge
Are the lounges worth the money? in my mind, yes, but each to their own.