I do that before I go xc-skiing in the winter. I'll have some carbs like a bagel and maybe a banana about 3 hours before I go out. xc-skiing is far more demanding than cycling (my HR is way up compared to cycling) so I'll be literally dead on my feet after an hour if I don't eat like that in the morning. With cycling I normally eat like that anyway regardless of whether I'm on the bike or not. If I don't eat I'll be out of gas after the first hill.

I don't ever recall going out on a full stomach for either activity. I'd be too groggy and feel generally sluggish if I did that.