When I go to the "details" of a run, I have a handy pace graph. But it's pretty much worthless because it's always a sawtooth. Ranging from 5:00 minute miles to 10:00 miles. I totally understand that over one sample the GPS is not accurate enough to give an accurate pace. When I'm running I only look at lap pace, which gives me a decent average.
What would be nice (and easy for GC developers to do) is to apply simple smoothing to the data, so that it takes out most of the spikes in the graph and provides more useful information. I run with a 1 mile auto lap, so I can see my mile pace, but on GC I get no useful information except when looking at splits. I suppose I could set up my 405 for 1/10 mile splits, but it would be so easy for GC to apply some smoothing.