I too went the Bronze C route.
hcjs
Major difference between gliders and SEP is that pilots of the former receive spin training and most gliders have dive-limiting air brakes. If all goes pear shaped you have the option of pulling out the brakes and waiting for the ground to appear, taking appropriate action when it does. If the thermals are taking you into cloud you usually also have plenty of height in hand.
Things that I think gliding gives you which you don't get during SEP training:-
Greater self-reliance. Some PPL's seem to find difficulty with non-radio circuits.
Better emergency training. When was the last time you had a PFL pulled halfway round the circuit and landed on the grass or on a runway different to the one in use or flew an abbreviated circuit, cutting corners to get in?
Better approach training. PPL's used to the visual cues of a marked runway can have problems with an unmarked field and the physical effort of returning a glider to the launch point after landing long soon teaches you to nail the approach speed and the touchdown point.
Visual separation. Adjusting your landing point to cope with close traffic becomes normal and instinctive when a go-around is not an option.
Better situational awareness on the ground. Visual checks of the approach become instinctive, whether you are preparing to take off or just moving about the airfield.
Balanced and efficient flying. Wasting energy in a glider sends you groundward, in a SEP you simply use more fuel.
Mike