I don't ride trails any more cause I think they are more dangerous than roads. I like to ride at a brisk pace and I find trails full of people at many different speed differentials, with their dogs, kids, headphones, etc. to be really dangerous, as the volume often exceeds the design capacity of the trails.
My least favoriite things are when you announce "on your right" and they move to the right, or when they move left and their leashed dog moves right, and people who stop and have a conversation right in the mddle
of the path. I also find that about 5% of people on closed to traffic loops, trails, parks, etc. insist on riding, running or walking opposite the prevailing bike and foot traffic. I usually give the a polite "you're safer on the right side" as I pass, but, of course, most don't hear because they have their headphones on and are isolated from the rest of the world. The reminder usually reply with a pleasant "f you"
But nobody should be pace lining and going balls to the wall on a crowded mixed use trail. That's just asking for trouble.
Oh well. Riding is still better than not riding!