Why do glider pilots constantly feel the need to go on about how gliding makes you a better pilot. Arguably almost all flying makes you a better pilot provided you're not boring holes in the sky mindlessly picking up bad habits.
Gliding is great, I've done a bit, but it's not for everyone and there are plenty of ways to improve your handling skills with an engine in front of you too. I also can't see how gliding helps much towards a commercial career, which is essentially what this bit of the forum is about.
Get relevant hours in your book that count towards your licence, have fun doing it and keep your mind on continually bettering yourself.