Well, strictly speaking it doesn't actually take ages.
Check me out with mine at
Untitled Document and you can see the harness has four straps to fix and adjust and it's not easy on your own.
Also, the glidecam sled out of the box is not easy to take the camera on and off. The trick to making it easy is to mount a quick release plate on top of the sled as I've done to make it much easier.
It just doesn't lend itself to being put on and taken off in 'real time' (and then you nees to double check th ebalance properly) so I do not think it really suitable for a single camera wedding shoot - not with the smooth shooter anyway.
If yous strong/fit enough enough then get the sled on it;s own (with a quick release plate) and you'll be well away for those 30 second shots.