Gliding is in my opinion the purist of the air sports. The wings kind of come out of your shoulders and the flying is so 'heads up' that flying becomes instinctive.
It takes about 8-10 minutes to get down from 1500-2000' so when you've been airborne for an hour you know you're doing something special!
Also makes good tailwheel pilot of you.
Only aerobatics can beat it!