Gliding is something all PPLs should do - in fact it should be part of the PPL Syllabus!!
I've only ever been gliding 2 or 3 times but I'm hooked - thanks guy at Borders Gliding.
Gliding teaches you to fly in balance using the rudders, it teaches you to fly using the merest pressure on the stick and you get lots of practice at Forced Landings too!. Its wonderfuly quiet and smooth, I remember that the tug was rocking all over the place in the turbulance but once we cast off the glider was really stable.
So try it - you won't regret it.