I had this happen to me today. On an organized ride, I got stuck in a cluster of "coasters." We were staying together on the uphills, but I was faster on the downhills and I was having to ride my brakes. I've gotten better at taking advantage of downhills and carrying the speed into the next uphill. I waited for about a 1/2 mile then finally pulled out and passed several people. I didn't see them again for several miles and happily let them go by.