Yeah...I am still trying to work out how to make glances more useful. One thing that bugs the heck out of me is that you can swipe through your glances and get to the end, but you can't keep going and loop back around to the first glance. Nope. You have to swipe back the other way to get back to the first glance. I'm hoping this will be fixed in Watch OS2. I'm also hoping that third party app glances will perform better. Sometimes the wait for a glance to refresh data defeats the purpose. It also defeats the purpose if you have to swipe through several cards to get to the glance you want.
I think the best way to use glances is to limit them to as few as possible based on: Is it information I actually need to browse in a glance? Is it information that changes throughout the day? Does it load reasonably fast? Does it provide the right amount of information in glance view? I may end up just taking it down to only the watch quick settings and the Music controls.
Sean