Correct me if I'm wrong, but the GC isn't the only thing that frees memory, is it? You can still free it manually (and are supposed to), so those leaks would have happened without a GC too, and it can only help things.
I'm getting the impression that posts here imply you're better off without a GC, I'm not sure if that's the intention, but it strikes me as wrong.
Your parent post spoke about going from one GC to another and having the problems disappear. Hence, it only implies that changing GC can have a useful effect.
Your message does betray some confusion about garbage collection. The basic principle of GC is that you do not deallocate RAM manually (and, under most GCs, cannot), and programs written under it expect deallocation to happen automatically. You are not 'supposed to' free manually, as that would be wasted effort, and some standard configurations of the Boehm collector actually ignore all calls to free().
There is a very useful description of garbage collection at http://blogs.msdn.com/b/oldnewthing/archive/2010/08/09/10047... which includes and expands on the useful mental model that "garbage collection is simulating a computer with an infinite amount of memory".
I'm getting the impression that posts here imply you're better off without a GC, I'm not sure if that's the intention, but it strikes me as wrong.