I been going gym since 2007. To be honest, I feel like it's a waste of money, although I only pay £15/month. To me, it's just a hobby and it's better then staying at home doing nothing.
I have seen no improvement in my fitness level and don't see any change in my body, maybe slightly more toned compared to 2007.
I usually do the same routine every time at the gym, maybe that's why I am bored of it.