On the last group ride I joined I tried hanging onto the wheel of the fast guys. I got dropped after about 5 miles, then I missed a turn or two and wound up having to thread my way through some messy road construction to find my way back on course. I did manage to chase back onto the slower bunch on the ride.
I haven't had too many clipless pedal falls. I guess all those years with toe straps and cleated bike shoes paid off. The last time I did I was pulling to a stop between two parked cars (mine and someone else's) and just wound up leaning on one of them.
I did crash on ice last winter. I had just threaded my way through a twisty little bottleneck on a MUP and the path was straightening out, so I was just spinning up to speed when I hit this patch of ice and crashed, falling over a guardrail onto the road next to the path. That'll teach me for using an unsalted MUP in the winter. I came out of it OK but my bike has a lovely ding on the top tube.